Stream Control Transmission Protocol (SCTP) Parameters

Created
2000-10
Last Updated
2026-08-13
Available Formats

XML
HTML
TXT

Registries Included Below

Chunk Types

Registration Procedure(s)
IETF Review
Reference
[RFC 9260]
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 [RFC9260].
Available Formats

CSV
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]
Available Formats

CSV
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]

DATA Chunk Flags

Available Formats

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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

CSV
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]
Available Formats

CSV
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]
Available Formats

CSV
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]
Available Formats

CSV
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]
Available Formats

CSV
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]
Available Formats

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

Contact Information

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
[Dongwook_Kim] Dongwook Kim mailto:dongwook.kim&etsi.org 2026-01-15
[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&simula.no 2025-10-07
[Yang_Xudong] Yang Xudong mailto:yangxudong&huawei.com 2019-05-24