2021-02-11 2026-03-30 provisional Expert Review provisional registration Date field update First Come First Served permanent Specification Required first unassigned codepoint Standards Action value 0x?a?a?a?a Reserved Jana Iyengar, Ian Swett, Martin Thomson 0x00000000 permanent 2021-02-11 IETF Reserved for Version Negotiation 0x00000001 permanent 2021-02-11 IETF 0x51303433 provisional 2021-10-15 Google Google QUIC Q043 0x51303436 provisional 2021-10-15 Google Google QUIC Q046 0x51303530 provisional 2021-10-15 Google Google QUIC Q050 0x6b3343cf permanent 2022-12-16 IETF 0x709a50c4 provisional 2022-12-16 IETF QUIC v2 draft codepoint provisional Expert Review provisional registration Date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required first unassigned codepoint Standards Action values 31 * N + 27 (for integer values of N) Reserved Jana Iyengar, Ian Swett, Martin Thomson 0x00 original_destination_connection_id permanent 2021-02-11 IETF 0x01 max_idle_timeout permanent 2021-02-11 IETF 0x02 stateless_reset_token permanent 2021-02-11 IETF 0x03 max_udp_payload_size permanent 2021-02-11 IETF 0x04 initial_max_data permanent 2021-02-11 IETF 0x05 initial_max_stream_data_bidi_local permanent 2021-02-11 IETF 0x06 initial_max_stream_data_bidi_remote permanent 2021-02-11 IETF 0x07 initial_max_stream_data_uni permanent 2021-02-11 IETF 0x08 initial_max_streams_bidi permanent 2021-02-11 IETF 0x09 initial_max_streams_uni permanent 2021-02-11 IETF 0x0a ack_delay_exponent permanent 2021-02-11 IETF 0x0b max_ack_delay permanent 2021-02-11 IETF 0x0c disable_active_migration permanent 2021-02-11 IETF 0x0d preferred_address permanent 2021-02-11 IETF 0x0e active_connection_id_limit permanent 2021-02-11 IETF 0x0f initial_source_connection_id permanent 2021-02-11 IETF 0x10 retry_source_connection_id permanent 2021-02-11 IETF 0x11 version_information permanent 2022-12-16 IETF 0x20 max_datagram_frame_size permanent 2021-10-20 IETF 0x3e initial_max_path_id permanent 2026-03-30 IETF 0x173e discard provisional 2022-06-02 Receiver silently discards. 0x26ab google handshake message provisional 2022-11-01 Google Used to carry Google internal handshake message 0x2ab2 grease_quic_bit permanent 2022-07-13 IETF 0x3127 initial_rtt provisional 2021-10-20 Google Initial RTT in microseconds 0x3128 google_connection_options provisional 2021-10-20 Google Google connection options for experimentation 0x3129 user_agent provisional 2021-10-20 Google User agent string (deprecated) 0x4752 google_version provisional 2021-10-20 Google Google QUIC version downgrade prevention 0xff73db version_information_draft provisional 2025-03-21 IETF Deprecated; use version_information instead 0x219bbcd0 google_debug_1 provisional 2025-09-23 0xff04de1b min_ack_delay provisional 2023-10-27 Mirja Kühlewind 0x4143414213370002 bdp_frame provisional 2024-01-24 Q Misell provisional Expert Review provisional registration Date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required first unassigned codepoint Standards Action Jana Iyengar, Ian Swett, Martin Thomson 0x00 PADDING permanent 2021-02-11 IETF 0x01 PING permanent 2021-02-11 IETF 0x02-0x03 ACK permanent 2021-02-11 IETF 0x04 RESET_STREAM permanent 2021-02-11 IETF 0x05 STOP_SENDING permanent 2021-02-11 IETF 0x06 CRYPTO permanent 2021-02-11 IETF 0x07 NEW_TOKEN permanent 2021-02-11 IETF 0x08-0x0f STREAM permanent 2021-02-11 IETF 0x10 MAX_DATA permanent 2021-02-11 IETF 0x11 MAX_STREAM_DATA permanent 2021-02-11 IETF 0x12-0x13 MAX_STREAMS permanent 2021-02-11 IETF 0x14 DATA_BLOCKED permanent 2021-02-11 IETF 0x15 STREAM_DATA_BLOCKED permanent 2021-02-11 IETF 0x16-0x17 STREAMS_BLOCKED permanent 2021-02-11 IETF 0x18 NEW_CONNECTION_ID permanent 2021-02-11 IETF 0x19 RETIRE_CONNECTION_ID permanent 2021-02-11 IETF 0x1a PATH_CHALLENGE permanent 2021-02-11 IETF 0x1b PATH_RESPONSE permanent 2021-02-11 IETF 0x1c-0x1d CONNECTION_CLOSE permanent 2021-02-11 IETF 0x1e HANDSHAKE_DONE permanent 2021-02-11 IETF 0x1f IMMEDIATE_ACK provisional 2023-10-27 Mirja Kühlewind 0x30-0x31 DATAGRAM permanent 2021-10-20 IETF 0x3e-0x3f PATH_ACK permanent 2026-03-30 IETF 0xaf ACK_FREQUENCY provisional 2023-10-27 Mirja Kühlewind 0x3e75 PATH_ABANDON permanent 2026-03-30 IETF 0x3e76 PATH_STATUS_BACKUP permanent 2026-03-30 IETF 0x3e77 PATH_STATUS_AVAILABLE permanent 2026-03-30 IETF 0x3e78 PATH_NEW_CONNECTION_ID permanent 2026-03-30 IETF 0x3e79 PATH_RETIRE_CONNECTION_ID permanent 2026-03-30 IETF 0x3e7a MAX_PATH_ID permanent 2026-03-30 IETF 0x3e7b PATHS_BLOCKED permanent 2026-03-30 IETF 0x3e7c PATH_CIDS_BLOCKED permanent 2026-03-30 IETF provisional Expert Review provisional registration Date field update First Come First Served permanent, 0x00-0x3f Standards Action or IESG Approval permanent, greater than 0x3f Specification Required first unassigned codepoint Standards Action Jana Iyengar, Ian Swett, Martin Thomson 0x00 NO_ERROR No error permanent 2021-02-11 IETF 0x01 INTERNAL_ERROR Implementation error permanent 2021-02-11 IETF 0x02 CONNECTION_REFUSED Server refuses a connection permanent 2021-02-11 IETF 0x03 FLOW_CONTROL_ERROR Flow control error permanent 2021-02-11 IETF 0x04 STREAM_LIMIT_ERROR Too many streams opened permanent 2021-02-11 IETF 0x05 STREAM_STATE_ERROR Frame received in invalid stream state permanent 2021-02-11 IETF 0x06 FINAL_SIZE_ERROR Change to final size permanent 2021-02-11 IETF 0x07 FRAME_ENCODING_ERROR Frame encoding error permanent 2021-02-11 IETF 0x08 TRANSPORT_PARAMETER_ERROR Error in transport parameters permanent 2021-02-11 IETF 0x09 CONNECTION_ID_LIMIT_ERROR Too many connection IDs received permanent 2021-02-11 IETF 0x0a PROTOCOL_VIOLATION Generic protocol violation permanent 2021-02-11 IETF 0x0b INVALID_TOKEN Invalid Token received permanent 2021-02-11 IETF 0x0c APPLICATION_ERROR Application error permanent 2021-02-11 IETF 0x0d CRYPTO_BUFFER_EXCEEDED CRYPTO data buffer overflowed permanent 2021-02-11 IETF 0x0e KEY_UPDATE_ERROR Invalid packet protection update permanent 2021-02-11 IETF 0x0f AEAD_LIMIT_REACHED Excessive use of packet protection keys permanent 2021-02-11 IETF 0x10 NO_VIABLE_PATH No viable network path exists permanent 2021-02-11 IETF 0x11 VERSION_NEGOTIATION_ERROR Error negotiating version permanent 2022-12-16 IETF 0x0100-0x01ff CRYPTO_ERROR TLS alert code permanent 2021-05-18 IETF 0x3e APPLICATION_ABANDON_PATH Path abandoned at the application's request permanent 2026-03-30 IETF 0x3e75 PATH_RESOURCE_LIMIT_REACHED Path abandoned due to resource limitations in the transport permanent 2026-03-30 IETF 0x3e76 PATH_UNSTABLE_OR_POOR Path abandoned due to unstable interfaces or poor performance permanent 2026-03-30 IETF 0x3e77 NO_CID_AVAILABLE_FOR_PATH Path abandoned due to no available connection IDs for the path permanent 2026-03-30 IETF 0x4143414213370002 BDP_TOKEN_ERROR The BDP token received from the client is invalid provisional 2024-01-24 Q Misell David Schinazi mailto:dschinazi.ietf&gmail.com 2022-06-02 Google mailto:quic-iana&google.com 2025-09-23 Mirja Kühlewind mailto:ietf&kuehlewind.net 2023-10-27 Q Misell mailto:q&as207960.net 2024-01-24 QUIC working group mailto:quic&ietf.org