2026-04-07 Permanent Expert Review Provisional First Come First Served Historical Expert Review CRI Scheme Number field: 0-999 Expert Review CRI Scheme Number field: 1000-20000 First Come First Served Registry: Mark Baker (primary), Murray Kucherawy (backup) CRI Scheme Number field: Henk Birkholz, Marco Tiloca Requests for permanent registration must be preceded by mailing list review, per Section 7.2 of . Schemes for which the primary reference is an Internet-Draft are generally considered to be provisional until the I-D is approved by the IETF for RFC publication, even when the specification requests permanent registration. The CRI Scheme Number column registers numeric identifiers for the URI Schemes registered. Registrants for the Uniform Resource Identifier (URI) Schemes Registry may indicate that there are special requirements on the CRI scheme number to be assigned for the new URI Scheme. If that is not the case, IANA will assign a value autonomously. If there is a special requirement, the value will be allocated via Expert Review by the Designated Expert for the "CRI Scheme Number" column. Registrants that want to indicate special requirements on a CRI Scheme Number for a new URI-Scheme assignment are encouraged to notify the core-parameters@ietf.org mailing list of these requirements early. For more information, see . aaa Diameter Protocol Permanent 13862 - aaas Diameter Protocol with Secure Transport Permanent 14526 - about about Permanent 3786 - acap application configuration access protocol Permanent 12705 - acct acct Permanent 10229 - prov/acd acd acd Provisional 6840 - prov/acr acr acr Provisional 10196 - prov/adiumxtra adiumxtra adiumxtra Provisional 6634 - prov/adt adt adt Provisional 5150 - prov/afp afp afp Provisional 13404 - afs Andrew File System global file names Provisional 10687 - prov/aim aim aim Provisional 10327 - prov/amss amss amss Provisional 10831 - prov/android android android Provisional 15061 - prov/appdata appdata appdata Provisional 7364 - prov/apt apt apt Provisional 7856 - prov/ar ar ar Provisional 5099 - prov/ari ari ari Provisional 3818 - prov/ark ark ark Provisional 3018 - prov/at at at (see reviewer notes) Provisional 6007 - prov/attachment attachment attachment Provisional 8577 - prov/aw aw aw Provisional 16051 - prov/barion barion barion Provisional 10225 - historic/bb bb bb Historical 5188 - prov/beshare beshare beshare Provisional 4674 - prov/bitcoin bitcoin bitcoin Provisional 9186 - prov/bitcoincash bitcoincash bitcoincash Provisional 7226 - prov/bl bl bluetooth (shortened) Provisional 10024 - prov/blob blob blob Provisional 11060 - prov/bluetooth bluetooth bluetooth Provisional 12052 - prov/bolo bolo bolo Provisional 8765 - prov/brid brid brid Provisional 8251 - prov/browserext browserext browserext Provisional 4327 - prov/cabal cabal cabal Provisional 11393 - prov/calculator calculator calculator Provisional 3783 - prov/callto callto callto Provisional 8713 - cap Calendar Access Protocol Permanent 9204 - prov/caip caip caip Provisional 1001 - prov/cast cast cast Provisional 1220 - prov/casts casts casts Provisional 12718 - prov/chrome chrome chrome Provisional 5728 - prov/chrome-extension chrome-extension chrome-extension Provisional 14667 - cid content identifier Permanent 15202 - coap coap Permanent 0 coap+tcp coap+tcp (see reviewer notes) Permanent 6 coap+ws coap+ws (see reviewer notes) Permanent 24 coaps coaps Permanent 1 coaps+tcp coaps+tcp (see reviewer notes) Permanent 7 coaps+ws coaps+ws (see reviewer notes) Permanent 25 prov/com-eventbrite-attendee com-eventbrite-attendee com-eventbrite-attendee Provisional 9278 - prov/content content content Provisional 8387 - prov/content-type content-type content-type Provisional 6030 - crid TV-Anytime Content Reference Identifier Permanent 5990 - prov/cstr cstr cstr Provisional 6730 - prov/cvs cvs cvs Provisional 12242 - prov/dab dab dab Provisional 6774 - prov/dat dat dat Provisional 10583 - data data Permanent 1946 - dav dav Permanent 4373 - prov/dhttp dhttp dhttp (see reviewer notes) Provisional 4549 - prov/diaspora diaspora diaspora Provisional 4598 - dict dictionary service protocol Permanent 3886 - prov/did did did Provisional 5 - prov/dilithium3 dilithium3 dilithium3 Provisional 1005 - prov/dis dis dis Provisional 17134 - prov/dlna-playcontainer dlna-playcontainer dlna-playcontainer Provisional 5557 - prov/dlna-playsingle dlna-playsingle dlna-playsingle Provisional 6144 - prov/dnp dnp dnp Provisional 15819 - dns Domain Name System Permanent 12932 - prov/dntp dntp dntp Provisional 14347 - doi doi Permanent 13014 - DOI URI Scheme prov/donau donau donau Provisional 10150 - prov/dpp dpp dpp Provisional 2442 - prov/drm drm drm Provisional 9859 - historic/drop drop drop Historical 16138 - prov/dtmi dtmi dtmi Provisional 17097 - dtn DTNRG research and development Permanent 7456 - dvb dvb Provisional 10380 - prov/dvx dvx dvx Provisional 11645 - prov/dweb dweb dweb Provisional 1328 - prov/ed2k ed2k ed2k Provisional 2790 - prov/eid eid eid Provisional 4929 - prov/elsi elsi elsi Provisional 13680 - prov/embedded embedded embedded Provisional 4193 - prov/ens ens ens Provisional 1982 - prov/esim esim esim Provisional 3032 - prov/ethereum ethereum ethereum Provisional 7913 - example example Permanent 5296 - prov/facetime facetime facetime Provisional 3795 - fax fax Historical 4053 - prov/feed feed feed Provisional 7520 - prov/feedready feedready feedready Provisional 11824 - prov/fido fido fido Provisional 5717 - file Host-specific file names Permanent 12068 - historic/filesystem filesystem filesystem Historical 3365 - prov/finger finger finger Provisional 17315 - prov/first-run-pen-experience first-run-pen-experience first-run-pen-experience Provisional 16069 - prov/fish fish fish Provisional 12634 - prov/fm fm fm Provisional 2806 - ftp File Transfer Protocol Permanent 14878 - prov/fuchsia-pkg fuchsia-pkg fuchsia-pkg Provisional 12806 - geo Geographic Locations Permanent 3342 - prov/gg gg gg Provisional 11055 - prov/git git git Provisional 13068 - prov/gitoid gitoid gitoid Provisional 3775 - prov/gizmoproject gizmoproject gizmoproject Provisional 10744 - go go Permanent 5705 - gopher The Gopher Protocol Permanent 8601 - prov/graph graph graph Provisional 11583 - historic/grd grd grd Historical 9444 - prov/gtalk gtalk gtalk Provisional 4709 - h323 H.323 Permanent 10317 - ham ham Provisional 6503 - prov/hcap hcap hcap Provisional 9875 - prov/hcp hcp hcp Provisional 6024 - prov/hs20 hs20 hs20 Provisional 1273 - http Hypertext Transfer Protocol Permanent 2 RFC9110, Section 4.2.1 https Hypertext Transfer Protocol Secure Permanent 3 RFC9110, Section 4.2.2 prov/hxxp hxxp hxxp Provisional 16728 - prov/hxxps hxxps hxxps Provisional 4714 - prov/hydrazone hydrazone hydrazone Provisional 6632 - prov/hyper hyper hyper Provisional 12876 - prov/i0 i0 i0 Provisional 10328 - iax Inter-Asterisk eXchange Version 2 Permanent 7126 - prov/ibi ibi ibi Provisional 1002 - prov/ibi- ibi- ibi- Provisional 1003 - prov/ilstring ilstring ilstring Provisional 12237 - icap Internet Content Adaptation Protocol Permanent 12566 - icon icon Provisional 14868 - prov/ilstring ilstring ilstring Provisional 12237 - im Instant Messaging Permanent 6883 - imap internet message access protocol Permanent 10119 - info Information Assets with Identifiers in Public Namespaces. (section 3) defines an "info" registry of public namespaces, which is maintained by NISO and can be accessed from . Permanent 13846 - prov/iotdisco iotdisco iotdisco Provisional 17170 - prov/ipfs ipfs ipfs Provisional 15972 - ipn ipn Permanent 8775 - prov/ipns ipns ipns Provisional 16933 - ipp Internet Printing Protocol Permanent 9318 - ipps Internet Printing Protocol over HTTPS Permanent 4419 - prov/irc irc irc Provisional 5425 - prov/irc6 irc6 irc6 Provisional 1905 - prov/ircs ircs ircs Provisional 8687 - iris Internet Registry Information Service Permanent 13986 - iris.beep iris.beep Permanent 15639 - iris.lwz iris.lwz Permanent 4590 - iris.xpc iris.xpc Permanent 12422 - iris.xpcs iris.xpcs Permanent 16134 - prov/isostore isostore isostore Provisional 7225 - prov/itms itms itms Provisional 14830 - perm/jabber jabber jabber Permanent 6109 - prov/jar jar jar Provisional 1578 - jms Java Message Service Provisional 3634 - prov/keyparc keyparc keyparc Provisional 9770 - prov/lastfm lastfm lastfm Provisional 11742 - prov/lbry lbry lbry Provisional 14010 - ldap Lightweight Directory Access Protocol Permanent 13442 - prov/ldaps ldaps ldaps Provisional 3906 - leaptofrogans leaptofrogans Permanent 16281 - prov/lid lid lid Provisional 10247 - prov/linkid linkid linkid Provisional 1819 - prov/lorawan lorawan lorawan Provisional 11718 - prov/lpa lpa lpa Provisional 6658 - prov/lvlt lvlt lvlt Provisional 5480 - prov/machineProvisioningProgressReporter machineProvisioningProgressReporter Windows Autopilot Modern Device Management status updates Provisional 5477 - prov/magnet magnet magnet Provisional 9805 - mailserver Access to data available from mail servers Historical 10868 - mailto Electronic mail address Permanent 12102 - prov/maps maps maps Provisional 14153 - prov/market market market Provisional 14595 - prov/matrix matrix matrix Provisional 9487 - prov/message message message Provisional 14460 - prov/microsoft.windows.camera microsoft.windows.camera microsoft.windows.camera Provisional 11857 - prov/microsoft.windows.camera.multipicker microsoft.windows.camera.multipicker microsoft.windows.camera.multipicker Provisional 7942 - prov/microsoft.windows.camera.picker microsoft.windows.camera.picker microsoft.windows.camera.picker Provisional 5883 - mid message identifier Permanent 3646 - prov/mms mms mms Provisional 12337 - modem modem Historical 9154 - prov/mongodb mongodb mongodb Provisional 13372 - prov/moz moz moz Provisional 6808 - prov/mqtt mqtt mqtt Provisional 10740 - prov/mqtts mqtts mqtts Provisional 14906 - prov/ms-access ms-access ms-access Provisional 6863 - prov/ms-appinstaller ms-appinstaller ms-appinstaller Provisional 5152 - prov/ms-browser-extension ms-browser-extension ms-browser-extension Provisional 14090 - prov/ms-calculator ms-calculator ms-calculator Provisional 3690 - prov/ms-drive-to ms-drive-to ms-drive-to Provisional 4102 - prov/ms-enrollment ms-enrollment ms-enrollment Provisional 14310 - prov/ms-excel ms-excel ms-excel Provisional 5536 - prov/ms-eyecontrolspeech ms-eyecontrolspeech ms-eyecontrolspeech Provisional 17381 - prov/ms-gamebarservices ms-gamebarservices ms-gamebarservices Provisional 12823 - prov/ms-gamingoverlay ms-gamingoverlay ms-gamingoverlay Provisional 1059 - prov/ms-getoffice ms-getoffice ms-getoffice Provisional 14366 - prov/ms-help ms-help ms-help Provisional 7809 - prov/ms-infopath ms-infopath ms-infopath Provisional 8830 - prov/ms-inputapp ms-inputapp ms-inputapp Provisional 6792 - prov/ms-launchremotedesktop ms-launchremotedesktop ms-launchremotedesktop Provisional 12174 - prov/ms-lockscreencomponent-config ms-lockscreencomponent-config ms-lockscreencomponent-config Provisional 12525 - prov/ms-media-stream-id ms-media-stream-id ms-media-stream-id Provisional 6388 - prov/ms-meetnow ms-meetnow ms-meetnow Provisional 15645 - prov/ms-mixedrealitycapture ms-mixedrealitycapture ms-mixedrealitycapture Provisional 6411 - prov/ms-mobileplans ms-mobileplans ms-mobileplans Provisional 11945 - prov/ms-newsandinterests ms-newsandinterests ms-newsandinterests Provisional 2945 - prov/ms-officeapp ms-officeapp ms-officeapp Provisional 14168 - prov/ms-people ms-people ms-people Provisional 1528 - prov/ms-personacard ms-personacard ms-personacard Provisional 1562 - prov/ms-powerpoint ms-powerpoint ms-powerpoint Provisional 16645 - prov/ms-project ms-project ms-project Provisional 11130 - prov/ms-publisher ms-publisher ms-publisher Provisional 16194 - prov/ms-recall ms-recall ms-recall Provisional 10183 - prov/ms-remotedesktop ms-remotedesktop ms-remotedesktop Provisional 5347 - prov/ms-remotedesktop-launch ms-remotedesktop-launch ms-remotedesktop-launch Provisional 8085 - prov/ms-restoretabcompanion ms-restoretabcompanion ms-restoretabcompanion Provisional 17175 - prov/ms-screenclip ms-screenclip ms-screenclip Provisional 10518 - prov/ms-screensketch ms-screensketch ms-screensketch Provisional 9453 - prov/ms-search ms-search ms-search Provisional 14034 - prov/ms-search-repair ms-search-repair ms-search-repair Provisional 15679 - prov/ms-secondary-screen-controller ms-secondary-screen-controller ms-secondary-screen-controller Provisional 13098 - prov/ms-secondary-screen-setup ms-secondary-screen-setup ms-secondary-screen-setup Provisional 15254 - prov/ms-settings ms-settings ms-settings Provisional 9075 - prov/ms-settings-airplanemode ms-settings-airplanemode ms-settings-airplanemode Provisional 5109 - prov/ms-settings-bluetooth ms-settings-bluetooth ms-settings-bluetooth Provisional 14180 - prov/ms-settings-camera ms-settings-camera ms-settings-camera Provisional 15773 - prov/ms-settings-cellular ms-settings-cellular ms-settings-cellular Provisional 15361 - prov/ms-settings-cloudstorage ms-settings-cloudstorage ms-settings-cloudstorage Provisional 10640 - prov/ms-settings-connectabledevices ms-settings-connectabledevices ms-settings-connectabledevices Provisional 11351 - prov/ms-settings-displays-topology ms-settings-displays-topology ms-settings-displays-topology Provisional 12029 - prov/ms-settings-emailandaccounts ms-settings-emailandaccounts ms-settings-emailandaccounts Provisional 11072 - prov/ms-settings-language ms-settings-language ms-settings-language Provisional 9981 - prov/ms-settings-location ms-settings-location ms-settings-location Provisional 10373 - prov/ms-settings-lock ms-settings-lock ms-settings-lock Provisional 11950 - prov/ms-settings-nfctransactions ms-settings-nfctransactions ms-settings-nfctransactions Provisional 10591 - prov/ms-settings-notifications ms-settings-notifications ms-settings-notifications Provisional 7868 - prov/ms-settings-power ms-settings-power ms-settings-power Provisional 13026 - prov/ms-settings-privacy ms-settings-privacy ms-settings-privacy Provisional 9198 - prov/ms-settings-proximity ms-settings-proximity ms-settings-proximity Provisional 3959 - prov/ms-settings-screenrotation ms-settings-screenrotation ms-settings-screenrotation Provisional 6755 - prov/ms-settings-wifi ms-settings-wifi ms-settings-wifi Provisional 15994 - prov/ms-settings-workplace ms-settings-workplace ms-settings-workplace Provisional 14936 - prov/ms-spd ms-spd ms-spd Provisional 6189 - prov/ms-stickers ms-stickers ms-stickers Provisional 10361 - prov/ms-sttoverlay ms-sttoverlay ms-sttoverlay Provisional 5410 - prov/ms-transit-to ms-transit-to ms-transit-to Provisional 7743 - prov/ms-useractivityset ms-useractivityset ms-useractivityset Provisional 9136 - prov/ms-uup ms-uup ms-uup Provisional 1560 - prov/ms-virtualtouchpad ms-virtualtouchpad ms-virtualtouchpad Provisional 15776 - prov/ms-visio ms-visio ms-visio Provisional 15163 - prov/ms-walk-to ms-walk-to ms-walk-to Provisional 14364 - prov/ms-whiteboard ms-whiteboard ms-whiteboard Provisional 11467 - prov/ms-whiteboard-cmd ms-whiteboard-cmd ms-whiteboard-cmd Provisional 14860 - prov/ms-widgetboard ms-widgetboard ms-widgetboard Provisional 12603 - prov/ms-widgets ms-widgets ms-widgets Provisional 4613 - prov/ms-word ms-word ms-word Provisional 16585 - prov/msnim msnim msnim Provisional 8041 - msrp Message Session Relay Protocol Permanent 11315 - msrps Message Session Relay Protocol Secure Permanent 13440 - prov/mss mss mss Provisional 12493 - perm/mt mt Matter protocol on-boarding payloads that are encoded for use in QR Codes and/or NFC Tags Permanent 12699 - mtqp Message Tracking Query Protocol Permanent 3358 - prov/mtrust mtrust mtrust Provisional 13062 - prov/mumble mumble mumble Provisional 11804 - mupdate Mailbox Update (MUPDATE) Protocol Permanent 12569 - prov/mvn mvn mvn Provisional 9585 - prov/mvrp mvrp mvrp (see reviewer notes) Provisional 13451 - prov/mvrps mvrps mvrps (see reviewer notes) Provisional 13228 - news USENET news Permanent 1895 - nfs network file system protocol Permanent 6516 - ni ni Permanent 10926 - nih nih Permanent 11428 - nntp USENET news using NNTP access Permanent 13499 - prov/notes notes notes Provisional 8766 - prov/num num Namespace Utility Modules Provisional 9965 - prov/ocf ocf ocf Provisional 10241 - prov/oid oid oid Provisional 16079 - prov/onenote onenote onenote Provisional 13608 - prov/onenote-cmd onenote-cmd onenote-cmd Provisional 16632 - opaquelocktoken opaquelocktokent Permanent 6341 - prov/openid openid OpenID Connect Provisional 1242 - OpenID Connect Core 1.0, Section 7.3 prov/openpgp4fpr openpgp4fpr openpgp4fpr Provisional 13094 - prov/otpauth otpauth otpauth Provisional 13829 - historic/p1 p1 p1 Historical 14982 - historic/pack pack pack Historical 13348 - prov/palm palm palm Provisional 10238 - prov/paparazzi paparazzi paparazzi Provisional 12599 - historic/payment payment payment Historical 1762 - prov/payto payto payto Provisional 6992 - pkcs11 PKCS#11 Permanent 9312 - prov/platform platform platform Provisional 2754 - pop Post Office Protocol v3 Permanent 10551 - pres Presence Permanent 14972 - prospero Prospero Directory Service Historical 14477 - prov/proxy proxy proxy Provisional 3503 - prov/psyc psyc psyc Provisional 1466 - prov/pttp pttp pttp Provisional 6903 - prov/pwid pwid pwid Provisional 17068 - prov/qb qb qb Provisional 12478 - prov/query query query Provisional 10147 - prov/quic-transport quic-transport quic-transport Provisional 6462 - prov/redis redis redis Provisional 8099 - prov/rediss rediss rediss Provisional 9338 - reload reload Permanent 12726 - prov/res res res Provisional 4153 - prov/resource resource resource Provisional 2284 - prov/rmi rmi rmi Provisional 16292 - rsync rsync Provisional 16884 - prov/rtmfp rtmfp rtmfp Provisional 3348 - prov/rtmp rtmp rtmp Provisional 3920 - rtsp Real-Time Streaming Protocol (RTSP) Permanent 15267 - rtsps Real-Time Streaming Protocol (RTSP) over TLS Permanent 4619 - rtspu Real-Time Streaming Protocol (RTSP) over unreliable datagram transport Permanent 11999 - prov/sarif sarif sarif Provisional 13650 - prov/secondlife secondlife query Provisional 16729 - prov/secret-token secret-token secret-token Provisional 7074 - service service location Permanent 17264 - session session Permanent 4355 - prov/sftp sftp query Provisional 5492 - prov/sgn sgn sgn Provisional 4882 - prov/shc shc shc Provisional 5823 - prov/shelter shelter shelter Provisional 15461 - shttp (OBSOLETE) Secure Hypertext Transfer Protocol Permanent 7874 - Status change of HTTP experiments to Historic sieve ManageSieve Protocol Permanent 5472 - prov/simpleledger simpleledger simpleledger Provisional 9544 - prov/simplex simplex simplex Provisional 15118 - sip session initiation protocol Permanent 12644 - sips secure session initiation protocol Permanent 9535 - prov/skype skype skype Provisional 2326 - prov/smb smb smb Provisional 7285 - prov/smp smp smp Provisional 11533 - sms Short Message Service Permanent 3524 - prov/smtp smtp smtp Provisional 13340 - snews NNTP over SSL/TLS Historical 13285 - snmp Simple Network Management Protocol Permanent 1165 - soap.beep soap.beep Permanent 8519 - soap.beeps soap.beeps Permanent 16300 - prov/soldat soldat soldat Provisional 6349 - prov/spacify spacify spacify Provisional 1000 - prov/spiffe spiffe spiffe Provisional 8093 - prov/spotify spotify spotify Provisional 12732 - prov/ssb ssb ssb Provisional 12400 - prov/ssh ssh ssh Provisional 7667 - prov/starknet starknet starknet Provisional 12458 - prov/steam steam steam Provisional 5134 - stun stun Permanent 14627 - stuns stuns Permanent 14901 - prov/submit submit submit Provisional 4951 - prov/svn svn svn Provisional 13923 - prov/swh swh swh Provisional 17039 - prov/swid swid swid (see reviewer notes) Provisional 14162 - RFC9393, Section 5.1 prov/swidpath swidpath swidpath (see reviewer notes) Provisional 5825 - RFC9393, Section 5.2 tag tag Permanent 16377 - prov/taler taler taler Provisional 2796 - prov/teamspeak teamspeak teamspeak Provisional 6924 - prov/teapot teapot teapot Provisional 15026 - prov/teapots teapots teapots Provisional 3375 - tel telephone Permanent 3143 - prov/teliaeid teliaeid teliaeid Provisional 13362 - telnet Reference to interactive sessions Permanent 10995 - tftp Trivial File Transfer Protocol Permanent 8300 - prov/things things things Provisional 2154 - perm/thismessage thismessage multipart/related relative reference resolution Permanent 14367 - historic/thzp thzp thzp Historical 11820 - tip Transaction Internet Protocol Permanent 6651 - tn3270 Interactive 3270 emulation sessions Permanent 14962 - prov/tool tool tool Provisional 15230 - turn turn Permanent 10333 - turns turns Permanent 1926 - tv TV Broadcasts Permanent 7923 - prov/udp udp udp Provisional 5217 - prov/unreal unreal unreal Provisional 15206 - prov/upn upn upn Provisional 1004 - historic/upt upt upt Historical 2747 - urn Uniform Resource Names Permanent 4 - prov/ut2004 ut2004 ut2004 Provisional 6609 - prov/uuid-in-package uuid-in-package uuid-in-package Provisional 4515 - prov/v-event v-event v-event Provisional 15579 - vemmi versatile multimedia interface Permanent 16918 - prov/ventrilo ventrilo ventrilo Provisional 12502 - prov/ves ves ves Provisional 10176 - historic/videotex videotex videotex Historical 2406 - prov/view-source view-source view-source Provisional 8506 - vnc Remote Framebuffer Protocol Permanent 11537 - prov/vscode vscode vscode Provisional 7812 - prov/vscode-insiders vscode-insiders vscode-insiders Provisional 3255 - prov/vsls vsls vsls Provisional 9816 - prov/w3 w3 w3 (see reviewer notes) Provisional 11799 - wais Wide Area Information Servers Historical 8454 - prov/wasm wasm wasm Provisional 15741 - prov/wasm-js wasm-js wasm-js Provisional 14709 - prov/wcr wcr wcr Provisional 11892 - prov/web+ap web+ap web+ap Provisional 17361 - prov/web3 web3 web3 Provisional 4559 - prov/webcal webcal webcal Provisional 4183 - prov/wifi wifi wifi Provisional 14867 - prov/wpid wpid wpid Historical 1658 - ws WebSocket connections Permanent 11962 wss Encrypted WebSocket connections Permanent 3119 prov/wtai wtai wtai Provisional 9910 - prov/wyciwyg wyciwyg wyciwyg Provisional 15641 - prov/xcompute xcompute xcompute Provisional 13785 - xcon xcon Permanent 10467 - xcon-userid xcon-userid Permanent 9520 - prov/xfire xfire xfire Provisional 15306 - prov/xftp xftp xftp Provisional 4315 - xmlrpc.beep xmlrpc.beep Permanent 3005 - xmlrpc.beeps xmlrpc.beeps Permanent 15805 - xmpp Extensible Messaging and Presence Protocol Permanent 15358 - prov/xrcp xrcp xrcp Provisional 4747 - prov/xri xri xri Provisional 11255 - prov/ymsgr ymsgr ymsgr Provisional 3837 - z39.50 Z39.50 information access Historical 1319 - z39.50r Z39.50 Retrieval Permanent 8159 - z39.50s Z39.50 Session Permanent 6380 - 0-0xFFFF Expert Review Single Allocator Identifiers only 0x10000-0x3FFFFFFF Expert Review 0x40000000-0x7FFFFFFF Experimental Use 0x80000000-0xFFFFFFFF Reserved Future Expansion >=0x100000000 Reserved Edward Birrane, Rick Taylor Default Allocator 0 0x0 0 RFC9758, Section 3.2.2 IETF The Consultative Committee for Space Data Systems 1 0x1 0 Interplanetary Networking Special Interest Group (IPNSIG) 2 0x2 0 Intuitive Machines Lunar Data Network Services 26 0x1A 0 European Space Agency 75 0x4B 0 The Johns Hopkins University Applied Physics Laboratory (JHU/APL) 237 0xED 0 SUNY Polytechnic Institute College of Engineering 256 0x100 0 Spatiam Corporation 257 0x101 0 SSC Space 258 0x102 0 Spacely Packets, LLC 300 0x12C 0 Agency A.R.N.I.E.C. - RoEduNet 2614 0xA36 0 TCT Networks Corporation 4242 0x1092 0 Aalyria Technologies Inc 16737 0x4161 0 European Space Agency 361472–362495 0x58400-0x587FF 10 bits Spatiam Corporation 65536-73727 0x10000-0x11FFF 13 bits Example Range 974848-978943 0xEE000-0xEEFFF 12 bits IETF Keith Scott 1-0x3FFF (1-16383) Private Use 0x4000-0xFFFFFFFE (16384-4294967294) Expert Review >=0x100000000 (>=4294967296) Invalid 0 Reserved for the Null ipn URI RFC9758, Section 3.1 1-16383 Reserved for Private Use 16384-2097151 Allocated to the Space Assigned Numbers Authority (SANA) for use by Consultative Committee for Space Data Systems (CCSDS) missions. 2097152-268435455 Reserved for Private or Experimental Use 268435456-268451839 Allocated to Spacely Packets, LLC to provide IPN/IP Gateway services to private sector stakeholders. 268451840-268468223 Allocated to SPATIAM CORPORATION to provide DTN services to organizations. 268468224-268484607 Allocated to Phoenix R&D GMBH to provide DTN services for secure messaging. 268484608-268500991 Allocated to LateLab AB for various terrestrial DTN deployments and services. 268500992-268517375 Allocated to MEIS d.o.o. from Slovenia for various terrestrial DTN testbeds. 268517376-268533759 Allocated to Digital Health Information Network Inc. for Space applications in digital health and terrestrial DTN services. 268533760-268550143 Allocated to Shirokuma-AI for artificial intelligence-driven space applications and terrestrial DTN services in the fields of healthcare, robotics, wearables and edge devices, information processing and discovery. 268550144-268566527 Assigned to LJCV Electronics for Development of an Experimental R&D DTN, STEM Education, space and terrestrial applications. 268566528-268582911 Allocated to TCT Networks Corporation to provide space and terrestrial DTN services to organizations. 268582912-268599295 Allocated to Bull Reef Aquaculture for underwater sensing, automation, and coral reef/climate change research applications. 268599296-268615679 XRTC-based terrestrial and interplanetary end-to-end DTN communication services to simplify mission planning and implementation by providing standardized data transmission services across agencies, institutions, contractors and suppliers. 268615680-268632063 Assigned to Intuitive Machines for terrestrial and Lunar Data Network DTN services. 268632064-268648447 Allocated to Opal Labs for terrestrial DTN HIL testbeds. 268648448-268664831 Allocated to the SUNY Polytechnic Institute College of Engineering for conducting academic research in applying Delay/Disruption Tolerant Networking to Networks in Challenging Environments. 268664832-268681215 Allocated to Critical Technologies Inc. for R&D and initial operational deployments of trustworthy networked autonomous cyber-physical systems. 268681216-268697599 Allocated to the Clarkson Open Source Institute (COSI) at Clarkson University for conducting academic research on networks in challenging environments. 268697600-268713983 Allocated to Viagenie to provide DTN services to organizations. 268713984-268730367 Intuitive Machines Bundle Protocol Routing and Network Architecture Research 268730368-268746751 Allocated to Comtron Space Software, Mar del Plata, Argentina for developing, testing and deploying software applications for space and earth using DTN. 268746752-268763135 Allocated to D3TN GmbH to provide DTN services and for DTN research and development projects. 268763136-268779519 Allocated to D3TN U.S. to provide DTN services and for DTN research and development projects. 268779520-268795903 Allocated to WIDE Project for conducting research and operating experimental applications related to interplanetary networking and communications in challenging environments. 268795904-268812286 RoEduNet DTN services for education and research 268812287-4294967294 Unassigned 4294967295 Reserved for LocalNode ipn URIs RFC9758, Section 3.4.2 >=4294967296 Invalid Edward Birrane, Rick Taylor, Brian Sipos 1-127 Private Use 128-255 Standards Action 0x0100-0x7FFF Private Use 0x8000-0xFFFF Specification Required 0x10000-0xFFFFFFFF Private Use >=0x100000000 Reserved for future expansion 0 The Administrative Endpoint RFC9758, Section 5.7 1-127 Reserved for Private Use 128-255 Unassigned 0x0100-0x7FFF Reserved for Private Use 0x8000-0xEEDF Unassigned 0xEEE0-0xEEEF Example Range 0xEEF0-0xFFFF Unassigned 0x10000-0xFFFFFFFF Reserved for Private Use >=0x100000000 Reserved for future expansion Aadesh Brahmbhatt mailto:aadeshvb&utexas.edu 2023-06-14 Aalyria Technologies, Inc. mailto:rtaylor&aalyria.com 2024-12-02 Abraham Makovetsky mailto:abraham&braavos.app 2023-01-05 Adam Barth mailto:abarth&google.com 2019-03-29 Adam Langley mailto:agl&google.com 2021-09-03 Alastair Green mailto:alastair.green&neotechnology.com. 2017-05-19 Alberto Montilla mailto:a.montilla&spatiam.com 2024-12-23 Alex Grintsvayg mailto:grin&lbry.com 2020-06-16 Alexey Melnikov mailto:alexey.melnikov&isode.com 2012-09-12 Alexander Forselius mailto:alexander&spacify.se 2025-12-09 Alexander Shishenko mailto:alex&librevault.com 2016-06-13 Antonio Walker mailto:any&wakuu.enterprises 2024-02-02 ARK Maintenance Agency mailto:marioxcc.mt&yandex.com 2019-08-22 Arweave Team mailto:sam&arweave.org 2021-08-23 Bíró Tamás mailto:tamas.biro&sensenet.com 2014-05-16 Bluesky PBLLC mailto:protocol&blueskyweb.xyz 2023-06-01 Bob Hinkle mailto:bohinkle&cisco.com 2019-06-24 Bob Van Zant mailto:bob&veznat.com 2011-11-14 Boštjan Grašič mailto:bostjan.grasic&meis.si 2022-12-29 Bradley Nelson mailto:bradnelson&google.com 2020-08-28 Bruno Tomas WBA OpenRoaming Work Group mailto:bruno&wballiance.com 2024-05-30 Cabal Club mailto:cabal&cblgh.org 2020-05-14 Chris Rebert 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Fanning mailto:mikefan&microsoft.com 2021-03-19 Michael Hedenus mailto:michael.hedenus&vitesco.com 2021-09-24 Michael Ranft mailto:Michael.Ranft&swr.de 2023-11-28 Mike Bishop mailto:mbishop&evequefou.be 2025-11-07 Mike Pietraszak mailto:mikepie&microsoft.com 2016-10-17 Mirko Nosenzo mailto:mirko.n&incomedia.eu 2013-09-20 Mongo DB, Inc https://www.mongodb.com/es/contact 2017-05-09 Mykyta Yevstifeyev mailto:evnikita2&gmail.com 2011-05-25 OASIS Open https://www.oasis-open.org 2021-03-19 okTurtles Foundation, Inc. mailto:hi&okturtles.org 2024-11-04 OMA-DMSE – Device Management Working Group at the Open Mobile Alliance mailto:OMA-DM&mail.openmobilealliance.org 2019-04-16 OMNA – Open Mobile Naming Authority of the Open Mobile Alliance mailto:OMA-OMNA&mail.openmobilealliance.org 2014-12-19 OPC Foundation randy.armstrong@opcfoundation.org 2025-02-21 Oscar Abelardo Garcia mailto:oscargarciacomtron&gmail.com 2023-08-23 Patrick Collins mailto:patrick&cyfrin.io 2025-12-30 Paul Frazee mailto:pfrazee&gmail.com 2023-06-01 Peter Hoddie mailto:peter&moddable.com 2021-02-19 Peter Lewandowski mailto:peter.lewandowski&cygate.se 2014-09-12 Peter Saint-Andre mailto:stpeter&jabber.org 2012-12-04 Peter Waher mailto:peterwaher&hotmail.com 2015-11-25 Pierre-Anthony Lemieux mailto:pal&sandflow.com 2024-11-19 Protocol Labs mailto:jbenet&protocol.ai 2020-05-14 Qi Zhou mailto:qizhou&web3q.io 2023-04-17 RadioDNS Project mailto:iana&radiodns.org 2019-03-18 Rick Taylor Aalyria Technologies, Inc. mailto:rtaylor&aalyria.com 2024-12-02 Ricky Bloomfield mailto:rickybloomfield&apple.com 2020-08-28 Robert C. Durst The Consultative Committee for Space Data Systems mailto:durst&mitre.org 2024-11-27 Agency A.R.N.I.E.C. - RoEduNet mailto:valeriu&roedu.net 2025-10-17 Dr. Ronny L. Bull TCT Networks Corporation mailto:rbull&tct-networks.com 2024-12-06 Dr. Ronny L. Bull mailto:ronny.bull&bullreefaquaculture.com 2023-05-04 Dr. Ronny L. Bull SUNY Polytechnic Institute College of Engineering mailto:bullr&sunypoly.edu 2024-12-06 Samo Grasic mailto:samo&grasic.net 2022-12-26 Samo Grasic mailto:samo.grasic&sscspace.com 2026-03-26 SAP SE mailto:ma.becker&sap.com 2019-07-04 Sauli Kiviranta mailto:sauli.kiviranta&deltacygnilabs.com 2023-05-16 Scott Johnson mailto:scott&solarnetone.org 2022-09-15 Scott Johnson Spacely Packets, LLC mailto:scott&spacelypackets.com 2024-12-02 Scott M. Johnson IPNSIG mailto:scott&base.luna.sol.int 2025-08-26 Secure Scuttlebutt Consortium mailto:christianbundy&fraction.io 2020-05-15 Shuai Wang mailto:wangshuai1&caict.ac.cn 2025-10-10 Software Heritage https://www.softwareheritage.org 2020-04-28 Soni L. mailto:fakedme&gmail.com 2023-01-09 Sophie Schenkel mailto:Sophie.Schenkel&dra.de 2023-11-28 Spacely Packets, LLC mailto:scott&spacelypackets.com 2024-12-02 Spatiam Corporation mailto:a.montilla&spatiam.com 2024-12-23 SSC Space mailto:samo.grasic&sscspace.com 2026-03-26 Stefano Zacchiroli mailto:zack&upsilon.cc 2020-04-28 Stuart W. 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