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Internet Assigned Numbers Authority

Secure Shell (SSH) Protocol Parameters

Created
2005-06-02
Last Updated
2025-10-06
Available Formats

XML
HTML
Plain text

Registries Included Below

Message Numbers

Registration Procedure(s)
Standards Action
Reference
[RFC4250]
Available Formats

CSV
ValueMessage IDReference
0Reserved
1SSH_MSG_DISCONNECT[RFC4253]
2SSH_MSG_IGNORE[RFC4253]
3SSH_MSG_UNIMPLEMENTED[RFC4253]
4SSH_MSG_DEBUG[RFC4253]
5SSH_MSG_SERVICE_REQUEST[RFC4253]
6SSH_MSG_SERVICE_ACCEPT[RFC4253]
7SSH_MSG_EXT_INFO[RFC8308]
8SSH_MSG_NEWCOMPRESS[RFC8308]
9-19Unassigned (Transport layer generic)
20SSH_MSG_KEXINIT[RFC4253]
21SSH_MSG_NEWKEYS[RFC4253]
22-29Unassigned (Algorithm negotiation)
30-49Reserved (key exchange method specific)[RFC4251]
50SSH_MSG_USERAUTH_REQUEST[RFC4252]
51SSH_MSG_USERAUTH_FAILURE[RFC4252]
52SSH_MSG_USERAUTH_SUCCESS[RFC4252]
53SSH_MSG_USERAUTH_BANNER[RFC4252]
54-59Unassigned (User authentication generic)
60SSH_MSG_USERAUTH_INFO_REQUEST[RFC4256]
61SSH_MSG_USERAUTH_INFO_RESPONSE[RFC4256]
62-79Reserved (User authentication method specific)[RFC4251]
80SSH_MSG_GLOBAL_REQUEST[RFC4254]
81SSH_MSG_REQUEST_SUCCESS[RFC4254]
82SSH_MSG_REQUEST_FAILURE[RFC4254]
83-89Unassigned (Connection protocol generic)
90SSH_MSG_CHANNEL_OPEN[RFC4254]
91SSH_MSG_CHANNEL_OPEN_CONFIRMATION[RFC4254]
92SSH_MSG_CHANNEL_OPEN_FAILURE[RFC4254]
93SSH_MSG_CHANNEL_WINDOW_ADJUST[RFC4254]
94SSH_MSG_CHANNEL_DATA[RFC4254]
95SSH_MSG_CHANNEL_EXTENDED_DATA[RFC4254]
96SSH_MSG_CHANNEL_EOF[RFC4254]
97SSH_MSG_CHANNEL_CLOSE[RFC4254]
98SSH_MSG_CHANNEL_REQUEST[RFC4254]
99SSH_MSG_CHANNEL_SUCCESS[RFC4254]
100SSH_MSG_CHANNEL_FAILURE[RFC4254]
101-127Unassigned (Channel related messages)
128-191Reserved (for client protocols)
192-255Reserved for Private Use (local extensions)

Disconnection Messages Reason Codes and Descriptions

Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
SSH_MSG_DISCONNECT 'description' and 'reason code' values
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
RangeRegistration Procedures
0x00000001-0xFDFFFFFFExpert Review
0xFE000000-0xFFFFFFFFReserved for Private Use
Reason CodeSymbolic NameReference
0x00000000Reserved
0x00000001SSH_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT[RFC4253]
0x00000002SSH_DISCONNECT_PROTOCOL_ERROR[RFC4253]
0x00000003SSH_DISCONNECT_KEY_EXCHANGE_FAILED[RFC4253]
0x00000004SSH_DISCONNECT_RESERVED[RFC4253]
0x00000005SSH_DISCONNECT_MAC_ERROR[RFC4253]
0x00000006SSH_DISCONNECT_COMPRESSION_ERROR[RFC4253]
0x00000007SSH_DISCONNECT_SERVICE_NOT_AVAILABLE[RFC4253]
0x00000008SSH_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED[RFC4253]
0x00000009SSH_DISCONNECT_HOST_KEY_NOT_VERIFIABLE[RFC4253]
0x0000000ASSH_DISCONNECT_CONNECTION_LOST[RFC4253]
0x0000000BSSH_DISCONNECT_BY_APPLICATION[RFC4253]
0x0000000CSSH_DISCONNECT_TOO_MANY_CONNECTIONS[RFC4253]
0x0000000DSSH_DISCONNECT_AUTH_CANCELLED_BY_USER[RFC4253]
0x0000000ESSH_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE[RFC4253]
0x0000000FSSH_DISCONNECT_ILLEGAL_USER_NAME[RFC4253]
0x00000010-0xFDFFFFFFUnassigned
0xFE000000-0xFFFFFFFFReserved for Private Use

Channel Connection Failure Reason Codes and Descriptions

Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
'reason code' values and 'description' values
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
RangeRegistration Procedures
0x00000001-0xFDFFFFFFExpert Review
0xFE000000-0xFFFFFFFFReserved for Private Use
Reason CodeSymbolic NameReference
0x00000000Reserved
0x00000001SSH_OPEN_ADMINISTRATIVELY_PROHIBITED[RFC4254]
0x00000002SSH_OPEN_CONNECT_FAILED[RFC4254]
0x00000003SSH_OPEN_UNKNOWN_CHANNEL_TYPE[RFC4254]
0x00000004SSH_OPEN_RESOURCE_SHORTAGE[RFC4254]
0x00000005-0xFDFFFFFFUnassigned
0xFE000000-0xFFFFFFFFReserved for Private Use

Extended Channel Data Transfer data_type_code and Data

Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
'data_type_code' values and 'data' values
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
RangeRegistration Procedures
0x00000001-0xFDFFFFFFExpert Review
0xFE000000-0xFFFFFFFFReserved for Private Use
data_type_codeSymbolic NameReference
0x00000000Reserved
0x00000001SSH_EXTENDED_DATA_STDERR[RFC4254]
0x00000002-0xFDFFFFFFUnassigned
0xFE000000-0xFFFFFFFFReserved for Private Use

Pseudo-Terminal Encoded Terminal Modes

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
opcode and argument values which make up the "encoded terminal modes" values
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
OpcodeArgumentDescriptionReferenceNote
0TTY_OP_ENDIndicates end of options.[RFC4250]
1VINTRInterrupt character; 255 if none. Similarly for the other characters.Not all of these characters aresupported on all systems.[RFC4254]Section 8
2VQUITThe quit character (sends SIGQUIT signal on POSIX systems).[RFC4254]Section 8
3VERASEErase the character to left of the cursor.[RFC4254]Section 8
4VKILLKill the current input line.[RFC4254]Section 8
5VEOFEnd-of-file character (sends EOF from the terminal).[RFC4254]Section 8
6VEOLEnd-of-line character in addition to carriage return and/or linefeed.[RFC4254]Section 8
7VEOL2Additional end-of-line character.[RFC4254]Section 8
8VSTARTContinues paused output (normally control-Q).[RFC4254]Section 8
9VSTOPPauses output (normally control-S).[RFC4254]Section 8
10VSUSPSuspends the current program.[RFC4254]Section 8
11VDSUSPAnother suspend character.[RFC4254]Section 8
12VREPRINTReprints the current input line.[RFC4254]Section 8
13VWERASEErases a word left of cursor.[RFC4254]Section 8
14VLNEXTEnter the next character typed literally, even if it is a special character[RFC4254]Section 8
15VFLUSHCharacter to flush output.[RFC4254]Section 8
16VSWTCHSwitch to a different shell layer.[RFC4254]Section 8
17VSTATUSPrints system status line (load, command, pid, etc).[RFC4254]Section 8
18VDISCARDToggles the flushing of terminal output.[RFC4254]Section 8
19-29Unassigned
30IGNPARThe ignore parity flag. The parameter SHOULD be 0 if this flag is FALSE,and 1 if it is TRUE.[RFC4254]Section 8
31PARMRKMark parity and framing errors.[RFC4254]Section 8
32INPCKEnable checking of parity errors.[RFC4254]Section 8
33ISTRIPStrip 8th bit off characters.[RFC4254]Section 8
34INLCRMap NL into CR on input.[RFC4254]Section 8
35IGNCRIgnore CR on input.[RFC4254]Section 8
36ICRNLMap CR to NL on input.[RFC4254]Section 8
37IUCLCTranslate uppercase characters to lowercase.[RFC4254]Section 8
38IXONEnable output flow control.[RFC4254]Section 8
39IXANYAny char will restart after stop.[RFC4254]Section 8
40IXOFFEnable input flow control.[RFC4254]Section 8
41IMAXBELRing bell on input queue full.[RFC4254]Section 8
42IUTF8Terminal input and output is assumed to be encoded in UTF-8.[RFC8160]
43-49Unassigned
50ISIGEnable signals INTR, QUIT, [D]SUSP.[RFC4254]Section 8
51ICANONCanonicalize input lines.[RFC4254]Section 8
52XCASEEnable input and output of uppercase characters by preceding their lowercaseequivalents with "\".[RFC4254]Section 8
53ECHOEnable echoing.[RFC4254]Section 8
54ECHOEVisually erase chars.[RFC4254]Section 8
55ECHOKKill character discards current line.[RFC4254]Section 8
56ECHONLEcho NL even if ECHO is off.[RFC4254]Section 8
57NOFLSHDon't flush after interrupt.[RFC4254]Section 8
58TOSTOPStop background jobs from output.[RFC4254]Section 8
59IEXTENEnable extensions.[RFC4254]Section 8
60ECHOCTLEcho control characters as ^(Char).[RFC4254]Section 8
61ECHOKEVisual erase for line kill.[RFC4254]Section 8
62PENDINRetype pending input.[RFC4254]Section 8
63-69Unassigned
70OPOSTEnable output processing.[RFC4254]Section 8
71OLCUCConvert lowercase to uppercase.[RFC4254]Section 8
72ONLCRMap NL to CR-NL.[RFC4254]Section 8
73OCRNLTranslate carriage return to newline (output).[RFC4254]Section 8
74ONOCRTranslate newline to carriage return-newline (output).[RFC4254]Section 8
75ONLRETNewline performs a carriage return (output).[RFC4254]Section 8
76-89Unassigned
90CS77 bit mode.[RFC4254]Section 8
91CS88 bit mode.[RFC4254]Section 8
92PARENBParity enable.[RFC4254]Section 8
93PARODDOdd parity, else even.[RFC4254]Section 8
94-127Unassigned
128TTY_OP_ISPEEDSpecifies the input baud rate in bits per second.[RFC4254]Section 8
129TTY_OP_OSPEEDSpecifies the output baud rate in bits per second.[RFC4254]Section 8
130-255Unassigned

Service Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Service NameReference
ssh-userauth[RFC4252]
ssh-connection[RFC4254]

Authentication Method Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Method NameReferenceNote
publickey[RFC4252]Section 7
password[RFC4252]Section 8
hostbased[RFC4252]Section 9
none[RFC4252]Section 5.2
keyboard-interactive[RFC4256]
gssapi-with-mic[RFC4462]
gssapi-keyex[RFC4462]
gssapi[RFC4462]
external-keyx[RFC4462]

Connection Protocol Channel Types

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Channel TypeReferenceNote
session[RFC4254]Section 6.1
x11[RFC4254]Section 6.3.2
forwarded-tcpip[RFC4254]Section 7.2
direct-tcpip[RFC4254]Section 7.2

Connection Protocol Global Request Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Request TypeReferenceNote
tcpip-forward[RFC4254]Section 7.1
cancel-tcpip-forward[RFC4254]Section 7.1

Connection Protocol Channel Request Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Request TypeReferenceNote
pty-req[RFC4254]Section 6.2
x11-req[RFC4254]Section 6.3.1
env[RFC4254]Section 6.4
shell[RFC4254]Section 6.5
exec[RFC4254]Section 6.5
subsystem[RFC4254]Section 6.5
window-change[RFC4254]Section 6.7
xon-xoff[RFC4254]Section 6.8
signal[RFC4254]Section 6.9
exit-status[RFC4254]Section 6.10
exit-signal[RFC4254]Section 6.10
break[RFC4335]

Signal Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
SignalReference
ABRT[RFC4254]
ALRM[RFC4254]
FPE[RFC4254]
HUP[RFC4254]
ILL[RFC4254]
INT[RFC4254]
KILL[RFC4254]
PIPE[RFC4254]
QUIT[RFC4254]
SEGV[RFC4254]
TERM[RFC4254]
USR1[RFC4254]
USR2[RFC4254]

Connection Protocol Subsystem Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Subsystem NameReference
publickey[RFC4819]
snmp[RFC5592]
netconf[RFC6242]
rpki-rtr[RFC6810]

Key Exchange Method Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9142][RFC9519]
Note
*All values beginning with the specified string and not containing "@".
Note
“OK to Implement” guidance entries for registrations that pre-date [RFC9142] are found in Table 12 in Section 4 of [RFC9142].
Note
When this registry is modified, the YANG module "iana-ssh-key-exchange-algs" [IANA registryyang-parameters] must be updated as defined in [RFC9644].
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Method NameReferenceNoteOK to Implement
diffie-hellman-group-exchange-sha1[RFC4419][RFC8270]Section 4.1SHOULD NOT
diffie-hellman-group-exchange-sha256[RFC4419][RFC8270]Section 4.2MAY
diffie-hellman-group1-sha1[RFC4253]Section 8.1SHOULD NOT
diffie-hellman-group14-sha1[RFC4253]Section 8.2MAY
diffie-hellman-group14-sha256[RFC8268]MUST
diffie-hellman-group15-sha512[RFC8268]MAY
diffie-hellman-group16-sha512[RFC8268]SHOULD
diffie-hellman-group17-sha512[RFC8268]MAY
diffie-hellman-group18-sha512[RFC8268]MAY
ecdh-sha2-*[RFC5656]MAY
ecmqv-sha2[RFC5656]MAY
gss-group1-sha1-*[RFC4462][RFC8732]SHOULD NOT
gss-group14-sha1-*[RFC4462][RFC8732]SHOULD NOT
gss-gex-sha1-*[RFC4462][RFC8732]SHOULD NOT
gss-[RFC4462]Section 2.6reserved
rsa1024-sha1[RFC4432]MUST NOT
rsa2048-sha256[RFC4432]MAY
ext-info-s[RFC8308]Section 2SHOULD
ext-info-c[RFC8308]Section 2SHOULD
gss-group14-sha256-*[RFC8732]SHOULD
gss-group15-sha512-*[RFC8732]MAY
gss-group16-sha512-*[RFC8732]MAY
gss-group17-sha512-*[RFC8732]MAY
gss-group18-sha512-*[RFC8732]MAY
gss-nistp256-sha256-*[RFC8732]SHOULD
gss-nistp384-sha384-*[RFC8732]SHOULD
gss-nistp521-sha512-*[RFC8732]SHOULD
gss-curve25519-sha256-*[RFC8732]SHOULD
gss-curve448-sha512-*[RFC8732]MAY
curve25519-sha256[RFC8731]SHOULD
curve448-sha512[RFC8731]MAY
ecdh-sha2-nistp256[RFC5656]SHOULD
ecdh-sha2-nistp384[RFC5656]SHOULD
ecdh-sha2-nistp521[RFC5656]SHOULD
sntrup761x25519-sha512[RFC-ietf-sshm-ntruprime-ssh-06]SHOULD
mlkem768nistp256-sha256[draft-kampanakis-curdle-ssh-pq-ke-04]MAY
mlkem1024nistp384-sha384[draft-kampanakis-curdle-ssh-pq-ke-04]MAY
mlkem768x25519-sha256[draft-kampanakis-curdle-ssh-pq-ke-04]MAY
mlkem512-sha256[draft-harrison-mlkem-ssh-01]MAY
mlkem768-sha256[draft-harrison-mlkem-ssh-01]MAY
mlkem1024-sha384[draft-harrison-mlkem-ssh-01]MAY

Encryption Algorithm Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
When this registry is modified, the YANG module "iana-ssh-encryption-algs" [IANA registryyang-parameters] must be updated as defined in [RFC9644].
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Encryption Algorithm NameReferenceNote
3des-cbc[RFC4253]Section 6.3
blowfish-cbc[RFC4253]Section 6.3
twofish256-cbc[RFC4253]Section 6.3
twofish-cbc[RFC4253]Section 6.3
twofish192-cbc[RFC4253]Section 6.3
twofish128-cbc[RFC4253]Section 6.3
aes256-cbc[RFC4253]Section 6.3
aes192-cbc[RFC4253]Section 6.3
aes128-cbc[RFC4253]Section 6.3
serpent256-cbc[RFC4253]Section 6.3
serpent192-cbc[RFC4253]Section 6.3
serpent128-cbc[RFC4253]Section 6.3
arcfour[RFC8758]HISTORIC
idea-cbc[RFC4253]Section 6.3
cast128-cbc[RFC4253]Section 6.3
none[RFC4253]Section 6.3
des-cbc[FIPS-46-3]HISTORIC, See page 4
arcfour128[RFC8758]HISTORIC
arcfour256[RFC8758]HISTORIC
aes128-ctr[RFC4344]
aes192-ctr[RFC4344]
aes256-ctr[RFC4344]
3des-ctr[RFC4344]
blowfish-ctr[RFC4344]
twofish128-ctr[RFC4344]
twofish192-ctr[RFC4344]
twofish256-ctr[RFC4344]
serpent128-ctr[RFC4344]
serpent192-ctr[RFC4344]
serpent256-ctr[RFC4344]
idea-ctr[RFC4344]
cast128-ctr[RFC4344]
AEAD_AES_128_GCM[RFC5647]Section 6.1
AEAD_AES_256_GCM[RFC5647]Section 6.2
chacha20-poly1305[draft-josefsson-ssh-chacha20-poly1305-openssh-01]

MAC Algorithm Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
When this registry is modified, the YANG module "iana-ssh-mac-algs" [IANA registryyang-parameters] must be updated as defined in [RFC9644].
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
MAC Algorithm NameReferenceNote
hmac-sha1[RFC4253]Section 6.4
hmac-sha1-96[RFC4253]Section 6.4
hmac-md5[RFC4253]Section 6.4
hmac-md5-96[RFC4253]Section 6.4
none[RFC4253]Section 6.4
AEAD_AES_128_GCM[RFC5647]Section 6.1
AEAD_AES_256_GCM[RFC5647]Section 6.2
hmac-sha2-256[RFC6668]Section 2
hmac-sha2-512[RFC6668]Section 2

Public Key Algorithm Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
*All values beginning with the specified string and not containing "@".
Note
When this registry is modified, the YANG module "iana-ssh-public-key-algs" [IANA registryyang-parameters] must be updated as defined in [RFC9644].
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Public Key Algorithm NamePublic Key FormatReferenceNote
ssh-dssssh-dss[RFC4253]Section 6.6
ssh-rsassh-rsa[RFC4253]Section 6.6
rsa-sha2-256ssh-rsa[RFC8332]Section 3
rsa-sha2-512ssh-rsa[RFC8332]Section 3
spki-sign-rsaspki-sign-rsa[RFC4253]Section 6.6
spki-sign-dssspki-sign-dss[RFC4253]Section 6.6
pgp-sign-rsapgp-sign-rsa[RFC4253]Section 6.6
pgp-sign-dsspgp-sign-dss[RFC4253]Section 6.6
nullnull[RFC4462]Section 5
ecdsa-sha2-*ecdsa-sha2-*[RFC5656]
x509v3-ssh-dssx509v3-ssh-dss[RFC6187]
x509v3-ssh-rsax509v3-ssh-rsa[RFC6187]
x509v3-rsa2048-sha256x509v3-rsa2048-sha256[RFC6187]
x509v3-ecdsa-sha2-*x509v3-ecdsa-sha2-*[RFC6187]
ssh-ed25519ssh-ed25519[RFC8709]
ssh-ed448ssh-ed448[RFC8709]

Compression Algorithm Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4250][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Compression Algorithm NameReferenceNote
none[RFC4253]Section 6.2
zlib[RFC4253]Section 6.2

SSH Public-Key File Header Tags

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4716][RFC9519]
Note
Tags beginning with x- Reserved for Private Use
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Header TagReferenceNote
subject[RFC4716]Section 3.3.1
comment[RFC4716]Section 3.3.2

Publickey Subsystem Request Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4819][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Request NameReference
version[RFC4819]
add[RFC4819]
remove[RFC4819]
list[RFC4819]
listattributes[RFC4819]

Publickey Subsystem Response Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4819][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Response NameReference
version[RFC4819]
status[RFC4819]
publickey[RFC4819]
attribute[RFC4819]

Publickey Subsystem Attributes

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC4819][RFC9519]
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Attribute NameReference
comment[RFC4819]
comment-language[RFC4819]
command-override[RFC4819]
subsystem[RFC4819]
x11[RFC4819]
shell[RFC4819]
exec[RFC4819]
agent[RFC4819]
env[RFC4819]
from[RFC4819]
port-forward[RFC4819]
reverse-forward[RFC4819]

Publickey Subsystem Status Codes

Reference
[RFC4819]
Available Formats

CSV
RangeRegistration Procedures
0-191Standards Action
192-255Reserved for Private Use
ValueStatus CodeReference
0SSH_PUBLICKEY_SUCCESS[RFC4819]
1SSH_PUBLICKEY_ACCESS_DENIED[RFC4819]
2SSH_PUBLICKEY_STORAGE_EXCEEDED[RFC4819]
3SSH_PUBLICKEY_VERSION_NOT_SUPPORTED[RFC4819]
4SSH_PUBLICKEY_KEY_NOT_FOUND[RFC4819]
5SSH_PUBLICKEY_KEY_NOT_SUPPORTED[RFC4819]
6SSH_PUBLICKEY_KEY_ALREADY_PRESENT[RFC4819]
7SSH_PUBLICKEY_GENERAL_FAILURE[RFC4819]
8SSH_PUBLICKEY_REQUEST_NOT_SUPPORTED[RFC4819]
9SSH_PUBLICKEY_ATTRIBUTE_NOT_SUPPORTED[RFC4819]
10-191Standards Action
192-255Reserved

Extension Names

Registration Procedure(s)
Expert Review
Expert(s)
Peter Yee, Markus Stenberg
Reference
[RFC8308][RFC9519]
Note
Names in the Extension Names table MUST follow the Conventions for Names defined in [RFC4250], Section 4.6.1.
Note
Registration requests should be sent to the mailing list described in [RFC9519]. If approved, designated experts should notify IANA within three weeks. For assistance, please contact iana@iana.org.
Available Formats

CSV
Extension NameReferenceNote
server-sig-algs[RFC8308]Section 3.1
delay-compression[RFC8308]Section 3.2
no-flow-control[RFC8308]Section 3.3
elevation[RFC8308]Section 3.4
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