ID Value	Chunk Type	Reference
0	Payload Data (DATA)	[RFC9260]
1	Initiation (INIT)	[RFC9260]
2	Initiation Acknowledgement (INIT ACK)	[RFC9260]
3	Selective Acknowledgement (SACK)	[RFC9260]
4	Heartbeat Request (HEARTBEAT)	[RFC9260]
5	Heartbeat Acknowledgement (HEARTBEAT ACK)	[RFC9260]
6	Abort (ABORT)	[RFC9260]
7	Shutdown (SHUTDOWN)	[RFC9260]
8	Shutdown Acknowledgement (SHUTDOWN ACK)	[RFC9260]
9	Operation Error (ERROR)	[RFC9260]
10	State Cookie (COOKIE ECHO)	[RFC9260]
11	Cookie Acknowledgement (COOKIE ACK)	[RFC9260]
12	Reserved for Explicit Congestion Notification Echo (ECNE)	[RFC9260]
13	Reserved for Congestion Window Reduced (CWR)	[RFC9260]
14	Shutdown Complete (SHUTDOWN COMPLETE)	[RFC9260]
15	Authentication Chunk (AUTH)	[RFC4895]
16-62	Unassigned
63	Reserved for IETF-defined Chunk Extensions	[RFC9260]
64	Payload Data supporting Interleaving (I-DATA)	[RFC8260]
65-126	Unassigned
127	Reserved for IETF-defined Chunk Extensions	[RFC9260]
128	Address Configuration Acknowledgment (ASCONF-ACK)	[RFC5061]
129	Unassigned
130	Re-configuration Chunk (RE-CONFIG)	[RFC6525]
131	Unassigned
132	Padding Chunk (PAD)	[RFC4820]
133-190	Unassigned
191	Reserved for IETF-defined Chunk Extensions	[RFC9260]
192	Forward TSN	[RFC3758]
193	Address Configuration Change Chunk (ASCONF)	[RFC5061]
194	I-FORWARD-TSN	[RFC8260]
195-254	Unassigned
255	Reserved for IETF-defined Chunk Extensions	[RFC9260]

ID Value	Chunk Parameter Type	Reference
1	Heartbeat Info	[RFC9260]
2-4	Unassigned
5	IPv4 Address	[RFC9260]
6	IPv6 Address	[RFC9260]
7	State Cookie	[RFC9260]
8	Unrecognized Parameter	[RFC9260]
9	Cookie Preservative	[RFC9260]
10	Unassigned
11	Host Name Address	[RFC9260]
12	Supported Address Types	[RFC9260]
13	Outgoing SSN Reset Request Parameter	[RFC6525]
14	Incoming SSN Reset Request Parameter	[RFC6525]
15	SSN/TSN Reset Request Parameter	[RFC6525]
16	Re-configuration Response Parameter	[RFC6525]
17	Add Outgoing Streams Request Parameter	[RFC6525]
18	Add Incoming Streams Request Parameter	[RFC6525]
19-32767	Unassigned
32768	Reserved for ECN Capable (0x8000)	[RFC9260]
32770	Random (0x8002)	[RFC4895]
32771	Chunk List (0x8003)	[RFC4895]
32772	Requested HMAC Algorithm Parameter (0x8004)	[RFC4895]
32773	Padding (0x8005)
32776	Supported Extensions (0x8008)	[RFC5061]
32777-49151	Unassigned
49152	Forward TSN supported (0xC000)	[RFC3758]
49153	Add IP Address (0xC001)	[RFC5061]
49154	Delete IP Address (0xC002)	[RFC5061]
49155	Error Cause Indication (0xC003)	[RFC5061]
49156	Set Primary Address (0xC004)	[RFC5061]
49157	Success Indication (0xC005)	[RFC5061]
49158	Adaptation Layer Indication (0xC006)	[RFC5061]
49159-65534	Unassigned
65535	Reserved for IETF-defined Chunk Extensions	[RFC9260]

Chunk Flag Value	Chunk Flag Name	Reference
0x01	E bit	[RFC9260]
0x02	B bit	[RFC9260]
0x04	U bit	[RFC9260]
0x08	I bit	[RFC9260]
0x10	Unassigned
0x20	Unassigned
0x40	Unassigned
0x80	Unassigned

Chunk Flag Value	Chunk Flag Name	Reference
0x01	T bit	[RFC9260]
0x02	Unassigned
0x04	Unassigned
0x08	Unassigned
0x10	Unassigned
0x20	Unassigned
0x40	Unassigned
0x80	Unassigned

Value	Cause Code	Reference
1	Invalid Stream Identifier	[RFC9260]
2	Missing Mandatory Parameter	[RFC9260]
3	Stale Cookie	[RFC9260]
4	Out of Resource	[RFC9260]
5	Unresolvable Address	[RFC9260]
6	Unrecognized Chunk Type	[RFC9260]
7	Invalid Mandatory Parameter	[RFC9260]
8	Unrecognized Parameters	[RFC9260]
9	No User Data	[RFC9260]
10	Cookie Received While Shutting Down	[RFC9260]
11	Restart of an Association with New Addresses	[RFC9260]
12	User-Initiated Abort	[RFC9260]
13	Protocol Violation	[RFC9260]
14-159	Unassigned
160	Request to Delete Last Remaining IP Address	[RFC5061]
161	Operation Refused Due to Resource Shortage	[RFC5061]
162	Request to Delete Source IP Address	[RFC5061]
163	Association Aborted due to illegal ASCONF-ACK	[RFC5061]
164	Request refused - no authorization	[RFC5061]
165-260	Unassigned
261	Unsupported HMAC Identifier	[RFC4895]
262-65535	Unassigned

Value	SCTP Payload Protocol Identifier	Reference	Date
0	Reserved by SCTP	[RFC9260]
1	IUA	[RFC4233]
2	M2UA	[RFC3331]
3	M3UA	[RFC4666]
4	SUA	[RFC3868]
5	M2PA	[RFC4165]
6	V5UA	[RFC3807]
7	H.248	[ITU-T Recommendation H.248 Annex H, "Transport over SCTP", November 2000.]
8	BICC/Q.2150.3	[ITU-T Recommendation Q.1902.1, "Bearer Independent Call Control protocol (Capability Set 2): Functional description", July 2001.][ITU-T Recommendation Q.2150.3, "Signalling Transport Converter On SCTP", to be published.]
9	TALI	[RFC3094]
10	DUA	[RFC4129]
11	ASAP	[RFC5352]
12	ENRP	[RFC5353]
13	H.323	[http://standard.pictel.com/ftp/avc-site/0206_Bru/AVD-2198.zip][H.323 over SCTP October 2002.]
14	Q.IPC/Q.2150.3	[ITU-T Recommendation Q.2631.1 "IP Connection Control Signaling Protocol - Capability Set 1", to be published.][ITU-T Recommendation Q.2150.3, "Signalling Transport Converter On SCTP", to be published.]
15	SIMCO <draft-kiesel-midcom-simco-sctp-00.txt>	[Sebastian_Kiesel]
16	DDP Segment Chunk	[RFC5043]
17	DDP Stream Session Control	[RFC5043]
18	S1 Application Protocol (S1AP)	[http://www.3gpp.org/ftp/Specs/latest/Rel-8/23_series/23401-840.zip][http://www.3gpp.org/Specification-Numbering][Rajeev_Koodli]
19	RUA	[http://www.3gpp.org/Specification-Numbering][http://www.3gpp.org/Specification-Numbering][John_Meredith]	2009-05-28
20	HNBAP	[http://www.3gpp.org/Specification-Numbering][TS 25.469][John_Meredith]	2009-05-28
21	ForCES-HP	[RFC5811]	2009-08-04
22	ForCES-MP	[RFC5811]	2009-08-04
23	ForCES-LP	[RFC5811]	2009-08-04
24	SBc-AP	[http://www.3gpp.org/Specification-Numbering][Kimmo_Kymalainen]	2009-08-20
25	NBAP	[http://www.3gpp.org/Specification-Numbering][Kimmo_Kymalainen]	2009-08-28
26	Unassigned
27	X2AP	[http://www.3gpp.org/Specification-Numbering][Kimmo_Kymalainen]	2009-08-28
28	IRCP - Inter Router Capability Protocol	[Randall_Stewart]	2010-04-13
29	LCS-AP	[http://www.3gpp.org/Specification-Numbering][Kimmo_Kymalainen]	2010-06-03
30	MPICH2	[Michael_Tuexen][http://www.mcs.anl.gov/research/projects/mpich2/]	2010-06-14
31	Service Area Broadcast Protocol (SABP)	[http://www.3gpp.org/Specification-Numbering][http://www.3gpp.org/Specification-Numbering][John_Meredith]	2010-09-29
32	Fractal Generator Protocol (FGP)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-01-31
33	Ping Pong Protocol (PPP)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-01-31
34	CalcApp Protocol (CALCAPP)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-01-31
35	Scripting Service Protocol (SSP)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-01-31
36	NetPerfMeter Protocol Control Channel (NPMP-CONTROL)	[Thomas_Dreibholz][http://www.iem.uni-due.de/~dreibh/netperfmeter/]	2011-01-31
37	NetPerfMeter Protocol Data Channel (NPMP-DATA)	[Thomas_Dreibholz][http://www.iem.uni-due.de/~dreibh/netperfmeter/]	2011-01-31
38	Echo (ECHO)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-02-02
39	Discard (DISCARD)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-02-02
40	Daytime (DAYTIME)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-02-02
41	Character Generator (CHARGEN)	[Thomas_Dreibholz][http://tdrwww.iem.uni-due.de/dreibholz/rserpool/]	2011-02-02
42	3GPP RNA	[Tonesi][http://www.3gpp.org/ftp/specs/html-info/25471.htm]	2011-02-04
43	3GPP M2AP	[Tonesi][http://www.3gpp.org/ftp/specs/html-info/36442.htm][http://www.3gpp.org/ftp/specs/html-info/36443.htm]	2011-02-04
44	3GPP M3AP	[Tonesi][http://www.3gpp.org/ftp/specs/html-info/36442.htm][http://www.3gpp.org/ftp/specs/html-info/36444.htm]	2011-02-04
45	SSH over SCTP	[Michael_Tuexen]	2011-03-14
46	Diameter in a SCTP DATA chunk	[RFC6733]
47	Diameter in a DTLS/SCTP DATA chunk	[RFC6733]
48	R14P. BER Encoded ASN.1 over SCTP	[Josip_Djuricic][http://www.release14.org/wp-content/uploads/2012/07/r14p.asn]
49	Generic Data Transfer (GDT) Protocol	[Damir_Franusic][https://github.com/link-mink]	2021-08-13
50	WebRTC DCEP	[RFC8832]	2013-09-20
51	WebRTC String	[RFC8831]	2013-09-20
52	WebRTC Binary Partial (deprecated)	[RFC8831]	2013-09-20
53	WebRTC Binary	[RFC8831]	2013-09-20
54	WebRTC String Partial (deprecated)	[RFC8831]	2013-09-20
55	3GPP PUA	[Dario_S_Tonesi][http://www.3gpp.org/DynaReport/25470.htm][http://www.3gpp.org/DynaReport/25467.htm]	2014-01-03
56	WebRTC String Empty	[RFC8831]	2014-08-22
57	WebRTC Binary Empty	[RFC8831]	2014-08-22
58	3GPP XwAP	[ 3GPP TS 36.462][KIMBA_DIT_ADAMOU_Boubacar]	2015-10-19
59	3GPP Xw-Control Plane	[ 3GPP TS 36.462][KIMBA_DIT_ADAMOU_Boubacar]	2015-11-17
60	3GPP NG Application Protocol (NGAP)	[ 3GPP TS 38.413][Luis_Lopes]	2017-04-20
61	3GPP Xn Application Protocol (XnAP)	[ 3GPP TS 38.423][Luis_Lopes]	2017-04-20
62	3GPP F1 Application Protocol (F1 AP)	[ 3GPP TS 38.473][Luis_Lopes]	2017-06-09
63	HTTP/SCTP	[Michael_Tuexen]	2018-03-20
64	3GPP E1 Application Protocol (E1AP)	[ 3GPP TS 38.463][Yang_Xudong]	2018-05-07
65	ELE2 Lawful Interception	[http://ele2.io][Damir_Franusic]	2019-03-11
66	3GPP NGAP over DTLS over SCTP	[ 3GPP TS 38.413][Yang_Xudong]	2019-05-24
67	3GPP XnAP over DTLS over SCTP	[ 3GPP TS 38.423][Yang_Xudong]	2019-05-24
68	3GPP F1AP over DTLS over SCTP	[ 3GPP TS 38.473][Yang_Xudong]	2019-05-24
69	3GPP E1AP over DTLS over SCTP	[ 3GPP TS 38.463][Yang_Xudong]	2019-05-24
70	E2-CP	[O-RAN_Alliance][Jun_Hyuk_Song]	2019-07-16
71	E2-UP	[O-RAN_Alliance][Jun_Hyuk_Song]	2019-07-16
72	E2-DU	[O-RAN_Alliance][Jun_Hyuk_Song]	2019-07-16
73	3GPP W1AP	[3GPP TS 37.473][Lionel_Morand]	2020-06-26
74-4241	Unassigned
4242	DTLS Chunk Key-Management Messages	[draft-westerlund-tsvwg-sctp-dtls-chunk-01]	2024-04-19
4243-4294967295	Unassigned

HMAC Identifier	Message Digest Algorithm	Reference
0	Reserved	[RFC4895]
1	SHA-1	[RFC4895]
2	Reserved	[RFC4895]
3	SHA-256	[RFC4895]
4-65535	Unassigned

Code Point (32-bit number)	Description	Reference
0	Unassigned	[RFC5061]
0x00000001	DDP	[RFC5043]
0x00000002-0xffffffff	Unassigned	[RFC5061]

ID	Name	Contact URI	Last Updated
[Damir_Franusic]	Damir Franusic	mailto:damir.franusic&gmail.com	2021-08-13
[Dario_S_Tonesi]	Dario S Tonesi	mailto:dario.tonesi&nsn.com	2014-01-03
[John_Meredith]	John Meredith	mailto:john.meredith&etsi.org	2010-09-29
[Josip_Djuricic]	Josip Djuricic	mailto:jd&release14.org	2012-06-08
[Jun_Hyuk_Song]	Jun Hyuk Song	mailto:junhyuk.song&samsung.com	2019-07-16
[KIMBA_DIT_ADAMOU_Boubacar]	KIMBA DIT ADAMOU, Boubacar	mailto:jinba&chinamobile.com	2015-11-17
[Kimmo_Kymalainen]	Kimmo Kymalainen	mailto:kimmo.kymalainen&etsi.org	2010-06-03
[Lionel_Morand]	Lionel Morand	mailto:lionel.morand&orange.com	2020-06-26
[Luis_Lopes]	Luis Lopes	mailto:llopes&qti.qualcomm.com	2017-04-20
[Michael_Tuexen]	Michael Tuexen	mailto:tuexen&fh-muenster.de	2018-03-20
[O-RAN_Alliance]	O-RAN Alliance	https://www.o-ran.org	2019-07-16
[Rajeev_Koodli]	Rajeev Koodli	mailto:rkoodli&starentnetworks.com	2008-12-19
[Randall_Stewart]	Randall Stewart	mailto:rrs&lakerest.net	2010-04-13
[Sebastian_Kiesel]	Sebastian Kiesel	mailto:kiesel&ikr.uni-stuttgart.de	2006-03-22
[Thomas_Dreibholz]	Thomas Dreibholz	mailto:dreibh&iem.uni-due.de	2011-01-31
[Yang_Xudong]	Yang Xudong	mailto:yangxudong&huawei.com	2019-05-24

Stream Control Transmission Protocol (SCTP) Parameters

Chunk Types

Chunk Parameter Types

Chunk Flags

DATA Chunk Flags

INIT Chunk Flags

INIT ACK Chunk Flags

SACK Chunk Flags

HEARTBEAT Chunk Flags

HEARTBEAT ACK Chunk Flags

ABORT Chunk Flags

SHUTDOWN Chunk Flags

SHUTDOWN ACK Chunk Flags

ERROR Chunk Flags

COOKIE ECHO Chunk Flags

COOKIE ACK Chunk Flags

ECNE Chunk Flags

CWR Chunk Flags

SHUTDOWN COMPLETE Chunk Flags

AUTH Chunk Flags

I-DATA Chunk Flags

ASCONF-ACK Chunk Flags

RE-CONFIG Chunk Flags

PAD Chunk Flags

FORWARD TSN Chunk Flags

ASCONF Chunk Flags

I-FORWARD-TSN Chunk Flags

Error Cause Codes

SCTP Payload Protocol Identifiers

Hashed Message Authentication Code (HMAC) Identifiers

Adaptation Code Points

Contact Information