Stream Control Transmission Protocol (SCTP) Parameters

Created

  • 2000-10

Last Updated

  • 2026-08-13

Available Formats

Chunk Types

Registration Procedure(s)

  • IETF Review

Reference

  • RFC 9260: Stream Control Transmission Protocol

Note

A Chunk Flags sub-registry will be created for each new Chunk Type. The registration procedure for those sub-registries is RFC Required RFC 8126. For more information, see Section 15.2 of RFC 9260.

Available Formats

ID Value Chunk Type Reference
0 Payload Data (DATA) RFC 9260
1 Initiation (INIT) RFC 9260
2 Initiation Acknowledgement (INIT ACK) RFC 9260
3 Selective Acknowledgement (SACK) RFC 9260
4 Heartbeat Request (HEARTBEAT) RFC 9260
5 Heartbeat Acknowledgement (HEARTBEAT ACK) RFC 9260
6 Abort (ABORT) RFC 9260
7 Shutdown (SHUTDOWN) RFC 9260
8 Shutdown Acknowledgement (SHUTDOWN ACK) RFC 9260
9 Operation Error (ERROR) RFC 9260
10 State Cookie (COOKIE ECHO) RFC 9260
11 Cookie Acknowledgement (COOKIE ACK) RFC 9260
12 Reserved for Explicit Congestion Notification Echo (ECNE) RFC 9260
13 Reserved for Congestion Window Reduced (CWR) RFC 9260
14 Shutdown Complete (SHUTDOWN COMPLETE) RFC 9260
15 Authentication Chunk (AUTH) RFC 4895
16-62 Unassigned
63 Reserved for IETF-defined Chunk Extensions RFC 9260
64 Payload Data supporting Interleaving (I-DATA) RFC 8260
65 DTLS (TEMPORARY - registered 2026-02-20, expires 2027-02-20) draft-ietf-tsvwg-sctp-dtls-chunk-01
66-126 Unassigned
127 Reserved for IETF-defined Chunk Extensions RFC 9260
128 Address Configuration Acknowledgment (ASCONF-ACK) RFC 5061
129 Unassigned
130 Re-configuration Chunk (RE-CONFIG) RFC 6525
131 Unassigned
132 Padding Chunk (PAD) RFC 4820
133-190 Unassigned
191 Reserved for IETF-defined Chunk Extensions RFC 9260
192 Forward TSN RFC 3758
193 Address Configuration Change Chunk (ASCONF) RFC 5061
194 I-FORWARD-TSN RFC 8260
195-254 Unassigned
255 Reserved for IETF-defined Chunk Extensions RFC 9260

Chunk Parameter Types

Registration Procedure(s)

  • IETF Review

Reference

  • RFC 9260: Stream Control Transmission Protocol

Available Formats

ID Value Chunk Parameter Type Reference
1 Heartbeat Info RFC 9260
2-4 Unassigned
5 IPv4 Address RFC 9260
6 IPv6 Address RFC 9260
7 State Cookie RFC 9260
8 Unrecognized Parameter RFC 9260
9 Cookie Preservative RFC 9260
10 Unassigned
11 Host Name Address RFC 9260
12 Supported Address Types RFC 9260
13 Outgoing SSN Reset Request Parameter RFC 6525
14 Incoming SSN Reset Request Parameter RFC 6525
15 SSN/TSN Reset Request Parameter RFC 6525
16 Re-configuration Response Parameter RFC 6525
17 Add Outgoing Streams Request Parameter RFC 6525
18 Add Incoming Streams Request Parameter RFC 6525
19-32767 Unassigned
32768 Reserved for ECN Capable (0x8000) RFC 9260
32769 Zero Checksum Acceptable (0x8001) RFC 9653
32770 Random (0x8002) RFC 4895
32771 Chunk List (0x8003) RFC 4895
32772 Requested HMAC Algorithm Parameter (0x8004) RFC 4895
32773 Padding (0x8005)
32774 DTLS Key Management (0x8006) (TEMPORARY - registered 2026-02-20, expires 2027-02-20) draft-ietf-tsvwg-sctp-dtls-chunk-01
32775 Unassigned
32776 Supported Extensions (0x8008) RFC 5061
32777-49151 Unassigned
49152 Forward TSN supported (0xC000) RFC 3758
49153 Add IP Address (0xC001) RFC 5061
49154 Delete IP Address (0xC002) RFC 5061
49155 Error Cause Indication (0xC003) RFC 5061
49156 Set Primary Address (0xC004) RFC 5061
49157 Success Indication (0xC005) RFC 5061
49158 Adaptation Layer Indication (0xC006) RFC 5061
49159-65534 Unassigned
65535 Reserved for IETF-defined Chunk Extensions RFC 9260

Chunk Flags

Registration Procedure(s)

  • RFC Required

Reference

  • RFC 9260: Stream Control Transmission Protocol

DATA Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 E bit RFC 9260
0x02 B bit RFC 9260
0x04 U bit RFC 9260
0x08 I bit RFC 9260
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

INIT Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

INIT ACK Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

SACK Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

HEARTBEAT Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

HEARTBEAT ACK Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

ABORT Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 T bit RFC 9260
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

SHUTDOWN Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

SHUTDOWN ACK Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

ERROR Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

COOKIE ECHO Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

COOKIE ACK Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

ECNE Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

CWR Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

SHUTDOWN COMPLETE Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 T bit RFC 9260
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

AUTH Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

I-DATA Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 E bit RFC 8260
0x02 B bit RFC 8260
0x04 U bit RFC 8260
0x08 I bit RFC 8260
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

ASCONF-ACK Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

RE-CONFIG Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

PAD Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

FORWARD TSN Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

ASCONF Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

I-FORWARD-TSN Chunk Flags

Available Formats

Chunk Flag Value Chunk Flag Name Reference
0x01 Unassigned
0x02 Unassigned
0x04 Unassigned
0x08 Unassigned
0x10 Unassigned
0x20 Unassigned
0x40 Unassigned
0x80 Unassigned

Error Cause Codes

Registration Procedure(s)

  • Specification Required

Expert(s)

  • Michael Tuexen, Randall Stewart

Reference

  • RFC 9260: Stream Control Transmission Protocol

Available Formats

Value Cause Code Reference
1 Invalid Stream Identifier RFC 9260
2 Missing Mandatory Parameter RFC 9260
3 Stale Cookie RFC 9260
4 Out of Resource RFC 9260
5 Unresolvable Address RFC 9260
6 Unrecognized Chunk Type RFC 9260
7 Invalid Mandatory Parameter RFC 9260
8 Unrecognized Parameters RFC 9260
9 No User Data RFC 9260
10 Cookie Received While Shutting Down RFC 9260
11 Restart of an Association with New Addresses RFC 9260
12 User-Initiated Abort RFC 9260
13 Protocol Violation RFC 9260
14-99 Unassigned
100 Missing DTLS Chunk Support (TEMPORARY - registered 2026-08-13, expires 2027-08-13) draft-ietf-tsvwg-sctp-dtls-chunk-04
101 No Common DTLS Key Management Method (TEMPORARY - registered 2026-08-13, expires 2027-08-13) draft-ietf-tsvwg-sctp-dtls-chunk-04
102 DTLS Key Management Tie Breaker Collision (TEMPORARY - registered 2026-08-13, expires 2027-08-13) draft-ietf-tsvwg-sctp-dtls-chunk-04
103 Incompatible DTLS Key Management Roles (TEMPORARY - registered 2026-08-13, expires 2027-08-13) draft-ietf-tsvwg-sctp-dtls-chunk-04
104-159 Unassigned
160 Request to Delete Last Remaining IP Address RFC 5061
161 Operation Refused Due to Resource Shortage RFC 5061
162 Request to Delete Source IP Address RFC 5061
163 Association Aborted due to illegal ASCONF-ACK RFC 5061
164 Request refused - no authorization RFC 5061
165-260 Unassigned
261 Unsupported HMAC Identifier RFC 4895
262-65535 Unassigned

SCTP Payload Protocol Identifiers

Registration Procedure(s)

  • First Come First Served

Reference

  • RFC 9260: Stream Control Transmission Protocol

Available Formats

Value SCTP Payload Protocol Identifier Reference Date
0 Reserved by SCTP RFC 9260
1 IUA RFC 4233
2 M2UA RFC 3331
3 M3UA RFC 4666
4 SUA RFC 3868
5 M2PA RFC 4165
6 V5UA RFC 3807
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 RFC 3094
10 DUA RFC 4129
11 ASAP RFC 5352
12 ENRP RFC 5353
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> draft-kiesel-midcom-simco-sctp-00; Sebastian Kiesel
16 DDP Segment Chunk RFC 5043
17 DDP Stream Session Control RFC 5043
18 S1 Application Protocol (S1AP) 3GPP TS 23.401; 3GPP TS 36.413; Rajeev Koodli
19 RUA 3GPP TS 25.467; 3GPP TS 25.468; Dongwook Kim 2009-05-28
20 HNBAP 3GPP TS 25.467; 3GPP TS 25.469; Dongwook Kim 2009-05-28
21 ForCES-HP RFC 5811 2009-08-04
22 ForCES-MP RFC 5811 2009-08-04
23 ForCES-LP RFC 5811 2009-08-04
24 SBc-AP 3GPP TS 29.168; Kimmo Kymalainen 2009-08-20
25 NBAP 3GPP TS 25.433; Kimmo Kymalainen 2009-08-28
26 Unassigned
27 X2AP 3GPP TS 36.423; Kimmo Kymalainen 2009-08-28
28 IRCP - Inter Router Capability Protocol Randall Stewart 2010-04-13
29 LCS-AP 3GPP TS 29.271; 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) 3GPP TS 25.467; 3GPP TS 25.419; Dongwook Kim 2010-09-29
32 Fractal Generator Protocol (FGP) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
33 Ping Pong Protocol (PPP) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
34 CalcApp Protocol (CALCAPP) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
35 Scripting Service Protocol (SSP) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
36 NetPerfMeter Protocol Control Channel (NPMP-CONTROL) Thomas Dreibholz; https://www.nntb.no/~dreibh/netperfmeter/
37 NetPerfMeter Protocol Data Channel (NPMP-DATA) Thomas Dreibholz; https://www.nntb.no/~dreibh/netperfmeter/
38 Echo (ECHO) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
39 Discard (DISCARD) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
40 Daytime (DAYTIME) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
41 Character Generator (CHARGEN) Thomas Dreibholz; https://www.nntb.no/~dreibh/rserpool/
42 3GPP RNA Tonesi; 3GPP TS 25.471 2011-02-04
43 3GPP M2AP Tonesi; 3GPP TS 36.442; 3GPP TS 36.443 2011-02-04
44 3GPP M3AP Tonesi; 3GPP TS 36.442; 3GPP TS 36.444 2011-02-04
45 SSH over SCTP Michael Tuexen 2011-03-14
46 Diameter in a SCTP DATA chunk RFC 6733
47 Diameter in a DTLS/SCTP DATA chunk RFC 6733
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 RFC 8832 2013-09-20
51 WebRTC String RFC 8831 2013-09-20
52 WebRTC Binary Partial (deprecated) RFC 8831 2013-09-20
53 WebRTC Binary RFC 8831 2013-09-20
54 WebRTC String Partial (deprecated) RFC 8831 2013-09-20
55 3GPP PUA Dario S Tonesi; 3GPP TS 25.470; 3GPP TS 25.467 2014-01-03
56 WebRTC String Empty RFC 8831 2014-08-22
57 WebRTC Binary Empty RFC 8831 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 O-RAN D2 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

Hashed Message Authentication Code (HMAC) Identifiers

Registration Procedure(s)

  • Specification Required

Expert(s)

  • Unassigned

Reference

  • RFC 4895: Authenticated Chunks for the Stream Control Transmission Protocol (SCTP)

Available Formats

HMAC Identifier Message Digest Algorithm Reference
0 Reserved RFC 4895
1 SHA-1 RFC 4895
2 Reserved RFC 4895
3 SHA-256 RFC 4895
4-65535 Unassigned

Adaptation Code Points

Registration Procedure(s)

  • IETF Review

Reference

  • RFC 5061: Stream Control Transmission Protocol (SCTP) Dynamic Address Reconfiguration

Available Formats

Code Point (32-bit number) Description Reference
0 Unassigned RFC 5061
0x00000001 DDP RFC 5043
0x00000002-0xffffffff Unassigned RFC 5061

Error Detection Methods

Registration Procedure(s)

  • Specification Required

Expert(s)

  • Michael Tuexen, Magnus Westerlund

Reference

  • RFC 9653: Zero Checksum for the Stream Control Transmission Protocol

Available Formats

ID Value Error Detection Method Reference
0 Reserved RFC 9653
1 SCTP over DTLS RFC 9653
2-4294967295 Unassigned

Contact Information

Name Contact URI Last Updated
Damir Franusic damir.franusic&gmail.com 2021-08-13
Dario S Tonesi dario.tonesi&nsn.com 2014-01-03
Dongwook Kim dongwook.kim&etsi.org 2026-01-15
Josip Djuricic jd&release14.org 2012-06-08
Jun Hyuk Song junhyuk.song&samsung.com 2019-07-16
KIMBA DIT ADAMOU, Boubacar jinba&chinamobile.com 2015-11-17
Kimmo Kymalainen kimmo.kymalainen&etsi.org 2010-06-03
Lionel Morand lionel.morand&orange.com 2020-06-26
Luis Lopes llopes&qti.qualcomm.com 2017-04-20
Michael Tuexen tuexen&fh-muenster.de 2018-03-20
O-RAN Alliance https://www.o-ran.org 2019-07-16
Rajeev Koodli rkoodli&starentnetworks.com 2008-12-19
Randall Stewart rrs&lakerest.net 2010-04-13
Sebastian Kiesel kiesel&ikr.uni-stuttgart.de 2006-03-22
Thomas Dreibholz dreibh&simula.no 2025-10-07
Yang Xudong yangxudong&huawei.com 2019-05-24