Well-Known URIs
Uniform Resource Identifier (URI) Schemes
2010-01-20
2026-04-01
Well-Known URIs
Specification Required
Mark Nottingham
New well-known URI registrations, along with changes to existing registrations, can be requested
using the registry interface or the mailing list defined in .
acme-challenge
IETF
RFC8555, Section 8.3
permanent
agent-card.json
Linux Foundation
permanent
amphtml
AMP Project (OpenJS Foundation)
provisional
api-catalog
IETF
permanent
appspecific
provisional
ashrae
permanent
assetlinks.json
permanent
broadband-labels
provisional
2026-02-25
brski
IETF
permanent
BRSKI has a registry at
caldav
IETF
permanent
see also
carddav
IETF
permanent
see also
change-password
W3C
provisional
cmp
IETF
permanent
CMP has a registry at
2025-01-14
coap
IETF
permanent
coap-eap
IETF
permanent
core
IETF
permanent
csaf
Common Security Advisory Framework Version 2.0, OASIS Standard
provisional
csaf-aggregator
Common Security Advisory Framework Version 2.0, OASIS Standard
provisional
csvm
W3C
permanent
did.json
provisional
did-configuration.json
provisional
dnt
permanent
dnt-policy.txt
Electronic Frontier Foundation
permanent
dots
IETF
permanent
2021-06-11
easy-proxy
provisional
ecips
provisional
edhoc
IETF
permanent
enterprise-network-security
ETSI TS 103 523-5 clause 4.3.4.3.4.2
permanent
enterprise-transport-security
ETSI TS 103 523-3 clause 4.3.8.3
permanent
est
IETF
permanent
2020-04-29
funding-manifest-urls
provisional
genid
W3C
RDF 1.1 Concepts and Abstract Syntax
permanent
gnap-as-rs
IETF
RFC9767, Section 3.1
permanent
gpc.json
W3C
Global Privacy Control (GPC)
provisional
gs1resolver
GS1 Digital Link, Section 7.11
permanent
hoba
IETF
RFC7486, Section 6
permanent
host-meta
IETF
permanent
The "host-meta" documents obtained from the same host using the HTTP and
HTTPS protocols (using default ports) MUST be identical.
host-meta.json
IETF
permanent
The "host-meta.json" documents obtained from the same host using the HTTP and
HTTPS protocols (using default ports) MUST be identical.
hosting-provider
provisional
http-opportunistic
IETF
RFC8164, Section 2.3
Status change of HTTP experiments to Historic
obsoleted
2021-12-28
ic-domains
provisional
idp-proxy
IETF
permanent
jmap
IETF
RFC8620, Section 2.2
permanent
keybase.txt
permanent
Related information: Documentation for the Keybase
command line
and API.
knx
provisional
looking-glass
RFC8522, Section 2
permanent
masque
IETF
permanent
For sub-suffix allocations, see the registry at .
2023-05-16
matrix
permanent
2023-06-20
mercure
provisional
mta-sts.txt
IETF
permanent
mud
obsoleted
2021-12-28
nfv-oauth-server-configuration
ETSI GS NFV-SEC 022 V2.7.1
permanent
2020-01-22
ni
IETF
permanent
nodeinfo
provisional
nostr.json
provisional
oauth-authorization-server
IESG
RFC8414, Section 3
permanent
oauth-protected-resource
IETF
RFC9728, Section 3
permanent
ohttp-gateway
IETF
permanent
openid-federation
Section 9 of OpenID Federation 1.0
provisional
open-resource-discovery
provisional
openid-configuration
permanent
openorg
permanent
oslc
permanent
pki-validation
Section 3.2.2.4.6 of version 1.3.8 of the CA/Browser Forum’s Baseline Requirements Certificate Policy for the Issuance and Management of Publicly-Trusted Certificates (“Baseline Requirements”)
permanent
See also
posh
IETF
permanent
The suffix "posh" is expected to be followed by
an additional path component consisting of a service name (say,
"spice") and a file extension of ".json", resulting in a full path
of, for instance, "/.well-known/posh/spice.json". Registration of
service names shall be requested by developers of the relevant
application protocols.
privacy-sandbox-attestations.json
deprecated
2026-04-01
private-token-issuer-directory
IETF
permanent
probing.txt
IETF
permanent
pvd
IETF
permanent
rd
IETF
permanent
related-website-set.json
deprecated
2026-04-01
reload-config
IETF
permanent
repute-template
IETF
permanent
resourcesync
permanent
sbom
IETF
permanent
See ISO/IEC 5962:2021 and SPDX.org
security.txt
IETF
permanent
ssf-configuration
provisional
ssh-known-hosts
provisional
sshfp
provisional
stun-key
IETF
permanent
tea
Transparency Exchange API (coming)
provisional
terraform.json
provisional
thread
permanent
time
permanent
timezone
IESG
permanent
tdmrep.json
W3C
provisional
tor-relay
The "tor-relay" Well-Known Resource Identifier
provisional
tpcd
The "tpcd/grace-period.json" Well-Known Resource Identifier
deprecated
2026-04-01
traffic-advice
provisional
trust.txt
JournalList.net
provisional
uma2-configuration
UMA 2.0 Grant for OAuth 2.0, Section 2
permanent
void
W3C
permanent
webauthn
W3C
permanent
webfinger
IETF
permanent
The query to the WebFinger resource will
include one or more parameters in the query string; see Section 4.1
of . Resources at this location are able to return a JSON
Resource Descriptor (JRD) as described in Section 4.4 of .
2013-09-06
webhook-authorized-senders.json
permanent
webweaver.json
provisional
wot
permanent
American Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE)
http://www.ashrae.org
2016-01-22
Automattic Inc.
https://automattic.com
2020-07-21
Broadband Internet Technical Advisory Group (BITAG)
https://www.bitag.org
2024-08-30
Bruce Leban
mailto:bruce&leban.us
2021-06-01
CA/Browser Forum
mailto:questions&cabforum.org
https://www.cabforum.org
2017-02-06
Christopher Gutteridge
mailto:cjg&ecs.soton.ac.uk
2015-05-29
Claims and Credentials WG
mailto:cc-wg&lists.identity.foundation
2023-01-31
Cynthia Revström
mailto:d6035904-6d06-4ef2-861b-81090738b440&email.cynthia.re
2020-07-21
David Crawshaw
mailto:david&zentus.com
2025-12-16
DFINITY Foundation
mailto:boundary-nodes&dfinity.org
2026-01-12
DigiOnline GmbH
https://www.digionline.de
2022-08-11
ECMA International TC54
https://ecma-international.org/technical-committees/tc54/
2026-02-28
ETSI
mailto:pnns&etsi.org
2019-06-26
ETSI (TC CYBER)
mailto:cybersupport&etsi.org
2022-02-07
The G3 Project
https://github.com/bytedance/g3
2025-05-01
Google Inc.
mailto:well-known-statements&google.com
2015-09-28
Google LLC
mailto:tpcd-mitigations-team&google.com
2024-05-08
GS1
mailto:phil.archer&gs1.org
2020-05-18
HashiCorp Terraform Team
https://github.com/hashicorp/terraform
2024-07-01
info at floss.fund
mailto:info&floss.fund
2025-04-02
Intempus ApS
mailto:api&intempus.dk
2025-09-29
Jeremy Roman
mailto:jbroman&chromium.org
2022-03-29
Kantara Initiative User-Managed Access Work Group
mailto:staff&kantarainitiative.org
2017-06-29
KNX Association
mailto:joost.demarest&knx.org
2023-08-15
Les-Tilleuls.coop
https://les-tilleuls.coop
2023-03-20
Markus Stubbig
mailto:stubbig.ietf&gmail.com
2018-12-07
National Information Standardization Organization (NISO)
mailto:nisohq&niso.org
2017-05-26
OASIS
https://www.oasis-open.org/
2020-12-29
OASIS Open
mailto:project-admin&oasis-open.org
2023-02-10
OpenID Foundation Artifact Binding Working Group
mailto:openid-specs-ab&lists.openid.net
2013-08-27
OpenID Foundation Shared Signals Working Group
mailto:openid-specs-risc&lists.openid.net
2024-04-18
Poul-Henning Kamp
mailto:phk&phk.freebsd.dk
2019-05-24
SAP SE
mailto:ospo&sap.com
2023-11-27
The Keybase Project
https://keybase.io/
2014-04-08
The Matrix.org Foundation C.I.C.
https://matrix.org
2019-04-16
Thread Group, Inc.
mailto:help&threadgroup.org
2018-11-29
Tor Project Development Mailing List
mailto:tor-dev&lists.torproject.org
2020-10-20
W3C Tracking Protection WG
http://www.w3.org/2011/tracking-protection/
2015-08-19
W3C WoT WG
mailto:team-wot&w3.org
2023-01-24
Wei Tang
mailto:hi&that.world
2019-04-10