Value,Parameter Name,Status,Specification,Date,Change Controller,Contact,Notes
0x00,original_destination_connection_id,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x01,max_idle_timeout,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x02,stateless_reset_token,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x03,max_udp_payload_size,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x04,initial_max_data,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x05,initial_max_stream_data_bidi_local,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x06,initial_max_stream_data_bidi_remote,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x07,initial_max_stream_data_uni,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x08,initial_max_streams_bidi,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x09,initial_max_streams_uni,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x0a,ack_delay_exponent,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x0b,max_ack_delay,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x0c,disable_active_migration,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x0d,preferred_address,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x0e,active_connection_id_limit,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x0f,initial_source_connection_id,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x10,retry_source_connection_id,permanent,"[RFC9000, Section 18.2]",2021-02-11,IETF,[QUIC_WG],
0x11,version_information,permanent,[RFC9368],2022-12-16,IETF,[QUIC_WG],
0x20,max_datagram_frame_size,permanent,[RFC9221],2021-10-20,IETF,[QUIC_WG],
0x173e,discard,provisional,[https://github.com/quicwg/base-drafts/wiki/Quantum-Readiness-test],2022-06-02,[David_Schinazi],[David_Schinazi],Receiver silently discards.
0x26ab,google handshake message,provisional,,2022-11-01,Google,[Google],Used to carry Google internal handshake message
0x2ab2,grease_quic_bit,permanent,[RFC9287],2022-07-13,IETF,[QUIC_WG],
0x3127,initial_rtt,provisional,,2021-10-20,Google,[Google],Initial RTT in microseconds
0x3128,google_connection_options,provisional,,2021-10-20,Google,[Google],Google connection options for experimentation
0x3129,user_agent,provisional,,2021-10-20,Google,[Google],User agent string (deprecated)
0x4752,google_version,provisional,,2021-10-20,Google,[Google],Google QUIC version downgrade prevention
0xff73db,version_information_draft,provisional,[draft-ietf-quic-version-negotiation-13],2025-03-21,IETF,[QUIC_WG],Deprecated; use version_information instead
0x219bbcd0,google_debug_1,provisional,,2025-09-23,[Google],[Google],
0xff04de1b,min_ack_delay,provisional,[draft-ietf-quic-ack-frequency-07],2023-10-27,Mirja K¨¹hlewind,[Mirja_Kuhlewind],
0x0f739bbc1b666d05,enable_multipath,provisional,"[draft-ietf-quic-multipath-05, Section 3]",2023-07-26,Yanmei Liu,[Yanmei_Liu],
0x0f739bbc1b666d06,enable_multipath(-06),provisional,"[draft-ietf-quic-multipath-06, Section 3]",2023-11-03,Yanmei Liu,[Yanmei_Liu],
0x0f739bbc1b666d0d,initial_max_path_id,provisional,"[draft-ietf-quic-multipath-15, Section 2.1]",2025-07-09,Yanmei Liu,[Yanmei_Liu],
0x4143414213370002,bdp_frame,provisional,[draft-misell-quic-bdp-token-02],2024-01-24,Q Misell,[Q_Misell],