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HTTP/1.1 302 Found Date: Wed, 08 Oct 2025 10:02:09 GMT Server: Apache X-Content-Type-Options: nosniff Vary: Accept-Encoding Location: https://www.iana.org/assignments/ipsec-registry/ipsec-registry.xhtml Content-Length: 0 X-Frame-Options: DENY X-Content-Type-Options: nosniff Referrer-Policy: same-origin Cross-Origin-Opener-Policy: same-origin Cache-Control: public, s-maxage=1800, max-age=3600 Expires: Wed, 08 Oct 2025 11:02:09 GMT Content-Type: text/html; charset=utf-8 Content-Security-Policy: upgrade-insecure-requests; default-src 'self' https://*.iana.org; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://www.google.com https://cse.google.com https://clients1.google.com; style-src 'self' 'unsafe-inline' https://www.google.com; child-src 'self' https://www.youtube.com https://clients1.google.com https://cse.google.com https://www.google.com/; img-src 'self' https://data.iana.org https://www.iana.org https://www.google.com https://www.googleapis.com https://clients1.google.com https://*.gstatic.com; Strict-Transport-Security: max-age=48211200; preload HTTP/1.1 200 OK Date: Wed, 08 Oct 2025 10:02:09 GMT Server: Apache X-Content-Type-Options: nosniff Vary: Accept-Encoding Last-Modified: Fri, 06 Dec 2024 19:45:37 GMT X-Frame-Options: DENY X-Content-Type-Options: nosniff Referrer-Policy: same-origin Cross-Origin-Opener-Policy: same-origin Cache-Control: public, s-maxage=1800, max-age=3600 Expires: Wed, 08 Oct 2025 11:02:09 GMT Content-Type: text/html; charset=UTF-8 Content-Encoding: gzip Content-Security-Policy: upgrade-insecure-requests; default-src 'self' https://*.iana.org; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://www.google.com https://cse.google.com https://clients1.google.com; style-src 'self' 'unsafe-inline' https://www.google.com; child-src 'self' https://www.youtube.com https://clients1.google.com https://cse.google.com https://www.google.com/; img-src 'self' https://data.iana.org https://www.iana.org https://www.google.com https://www.googleapis.com https://clients1.google.com https://*.gstatic.com; Transfer-Encoding: chunked Strict-Transport-Security: max-age=48211200; preload Internet Key Exchange (IKE) Attributes

Internet Key Exchange (IKE) Attributes

Last Updated

2024-12-06

Note

All registries listed below have been closed. See [RFC9395].

Note

Attribute Assigned Numbers
Attributes negotiated during phase one use the following definitions.
Phase two attributes are defined in the applicable DOI specification
(for example, IPsec attributes are defined in the IPsec DOI), with the
exception of a group description when Quick Mode includes an ephemeral
Diffie-Hellman exchange.  Attribute types can be either Basic (B) or
Variable-length (V). Encoding of these attributes is defined in the
base ISAKMP specification as Type/Value (Basic) and Type/Length/Value
(Variable).
Attributes described as basic MUST NOT be encoded as variable.
Variable length attributes MAY be encoded as basic attributes if their
value can fit into two octets. If this is the case, an attribute
offered as variable (or basic) by the initiator of this protocol MAY
be returned to the initiator as a basic (or variable).

Available Formats

XML

HTML

Plain text

Registries Included Below

Attribute Classes
Encryption Algorithm Class Values (Value 1)
Hash Algorithm (Value 2)
IPSEC Authentication Methods (Value 3)
Group Description (Value 4)
Group Type (Value 5)
Life Type (Value 11)
PRF (Value 13)
Exchange Type
Additional Exchanges Defined-- XCHG values
ISAKMP Domain of Interpretation (DOI)
Next Payload Types
Notify Message Types
Notify Messages - Error Types (1-8191)
- Notify Messages - Status Types (16384-24575)

Attribute Classes

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Available Formats

CSV

Value	Class	Type	Reference
1	Encryption Algorithm	B	[RFC2409]
2	Hash Algorithm	B	[RFC2409]
3	Authentication Method	B	[RFC2409]
4	Group Description	B	[RFC2409]
5	Group Type	B	[RFC2409]
6	Group Prime/Irreducible Polynomial	V	[RFC2409]
7	Group Generator One	V	[RFC2409]
8	Group Generator Two	V	[RFC2409]
9	Group Curve A	V	[RFC2409]
10	Group Curve B	V	[RFC2409]
11	Life Type	B	[RFC2409]
12	Life Duration	V	[RFC2409]
13	PRF	B	[RFC2409]
14	Key Length	B	[RFC2409]
15	Field Size	B	[RFC2409]
16	Group Order	V	[RFC2409]
17-16383	Unassigned
16384-32767	Reserved for private use

Encryption Algorithm Class Values (Value 1)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Available Formats

CSV

Value	Ecryption Algorithm	Reference
0	Reserved
1	DES-CBC	[RFC2405]
2	IDEA-CBC	[RFC2409]
3	Blowfish-CBC	[RFC2409]
4	RC5-R16-B64-CBC	[RFC2409]
5	3DES-CBC	[RFC2409]
6	CAST-CBC	[RFC2409]
7	AES-CBC	[RFC3602]
8	CAMELLIA-CBC	[RFC4312]
9-65000	Unassigned
65001-65535	Reserved for private use

Hash Algorithm (Value 2)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Available Formats

CSV

Value	Hash Algorithm	Reference
0	Reserved
1	MD5	[RFC1321]
2	SHA	[NIST, FIPS PUB 180-1: Secure Hash Standard, April 1995.]
3	Tiger	[Anderson, R., and Biham, E., "Fast Software Encryption", Springer LNCS v. 1039, 1996.]
4	SHA2-256	[RFC4868]
5	SHA2-384	[RFC4868]
6	SHA2-512	[RFC4868]
7-65000	Unassigned
65001-65535	Reserved for private use

IPSEC Authentication Methods (Value 3)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Available Formats

CSV

Value	Method	Reference
0	Reserved
1	pre-shared key	[RFC2409]
2	DSS signatures	[RFC2409]
3	RSA signatures	[RFC2409]
4	Encryption with RSA	[RFC2409]
5	Revised encryption with RSA	[RFC2409]
6	Reserved (was Encryption with El-Gamal)
7	Reserved (was Revised encryption with El-Gamal)
8	Reserved (was ECDSA signatures)
9	ECDSA with SHA-256 on the P-256 curve	[RFC4754]
10	ECDSA with SHA-384 on the P-384 curve	[RFC4754]
11	ECDSA with SHA-512 on the P-521 curve	[RFC4754]
12-65000	Unassigned
65001-65535	Reserved for private use

Group Description (Value 4)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Note

These values were reserved as per draft-ipsec-ike-ecc-groups
which never made it to the RFC. These values might be used by some
implementations as currently registered in the registry, but new
implementations should not use them.

Available Formats

CSV

Value	Group Description	Reference	Note
0	Reserved
1	default 768-bit MODP group	[RFC2409]	Section 6.1
2	alternate 1024-bit MODP group	[RFC2409]	Section 6.2
3	EC2N group on GP[2^155]	[RFC2409]	Section 6.3
4	EC2N group on GP[2^185]	[RFC2409]	Section 6.4
5	1536-bit MODP group	[RFC3526]	Section 2
6	EC2N group over GF[2^163](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.1
7	EC2N group over GF[2^163](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.2
8	EC2N group over GF[2^283](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.3
9	EC2N group over GF[2^283](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.4
10	EC2N group over GF[2^409](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.5
11	EC2N group over GF[2^409](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.6
12	EC2N group over GF[2^571](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.7
13	EC2N group over GF[2^571](see Note)	[draft-ietf-ipsec-ike-ecc-groups-10]	Section 2.8
14	2048-bit MODP group	[RFC3526]	Section 3
15	3072-bit MODP group	[RFC3526]	Section 4
16	4096-bit MODP group	[RFC3526]	Section 5
17	6144-bit MODP group	[RFC3526]	Section 6
18	8192-bit MODP group	[RFC3526]	Section 7
19	256-bit random ECP group	[RFC5903]
20	384-bit random ECP group	[RFC5903]
21	521-bit random ECP group	[RFC5903]
22	1024-bit MODP Group with 160-bit Prime Order Subgroup	[RFC5114]
23	2048-bit MODP Group with 224-bit Prime Order Subgroup	[RFC5114]
24	2048-bit MODP Group with 256-bit Prime Order Subgroup	[RFC5114]
25	192-bit Random ECP Group	[RFC5114]
26	224-bit Random ECP Group	[RFC5114]
27	224-bit Brainpool ECP group	[RFC6932]	Section 2.1. Not for RFC 2409.
28	256-bit Brainpool ECP group	[RFC6932]	Section 2.2. Not for RFC 2409.
29	384-bit Brainpool ECP group	[RFC6932]	Section 2.3. Not for RFC 2409.
30	512-bit Brainpool ECP group	[RFC6932]	Section 2.4. Not for RFC 2409.
31-32767	Unassigned
32768-65535	Reserved for private use

Group Type (Value 5)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Available Formats

CSV

Value	Group Type	Reference
0	Reserved
1	MODP (modular exponentiation group)	[RFC2409]
2	ECP (elliptic curve group over GF[P])	[RFC2409]
3	EC2N (elliptic curve group over GF[2^N])	[RFC2409]
4-65000	Unassigned
65001-65535	Reserved for private use

Life Type (Value 11)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Note

For a given "Life Type" the value of the "Life Duration" attribute defines
the actual length of the SA life -- either a number of seconds, or a number
of kbytes protected.

Available Formats

CSV

Value	Life Type	Reference
0	Reserved
1	seconds	[RFC2409]
2	kilobytes	[RFC2409]
3-65000	Unassigned
65001-65535	Reserved for private use

PRF (Value 13)

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Value	Description	Reference
No registrations at this time.

Exchange Type

Registration Procedure(s)

Registry closed

Reference

[RFC2408][RFC9395]

Note

DOI Specific use is the Additional Exchanges Defined registry

Available Formats

CSV

Value	Exchange Type	Reference
0	NONE	[RFC2408]
1	Base	[RFC2408]
2	Identity Protection	[RFC2408]
3	Authentication Only	[RFC2408]
4	Aggressive	[RFC2408]
5	Informational	[RFC2408]
6-31	ISAKMP Future Use
32-239	DOI Specific Use
240-255	Private Use

Additional Exchanges Defined-- XCHG values

Registration Procedure(s)

Registry closed

Reference

[RFC2409][RFC9395]

Available Formats

CSV

Value	Phase	Reference
32	Quick Mode	[RFC2409]
33	New Group Mode	[RFC2409]

ISAKMP Domain of Interpretation (DOI)

Registration Procedure(s)

Registry closed

Reference

[RFC2408][RFC9395]

Note

The Domain of Interpretation is a 32-bit value which identifies the
context in which the Security Association payload is to be evaluated.
Requests for assignments of new domain of interpretation identifiers
must be accompanied by a public specification, such as an Internet RFC.

Available Formats

CSV

Value	DOI	Reference
0	ISAKMP	[RFC2408]
1	IPSEC	[RFC2407]
2	GDOI	[RFC3547]

Next Payload Types

Registration Procedure(s)

Registry closed

Reference

[RFC2408][RFC9395]

Note

The Next Payload type is an 8-bit value that indicates the type of the
next payload in the message.

Available Formats

CSV

Value	Next Payload Type	Reference
0	NONE	[RFC2408]
1	Security Association (SA)	[RFC2408]
2	Proposal (P)	[RFC2408]
3	Transform (T)	[RFC2408]
4	Key Exchange (KE)	[RFC2408]
5	Identification (ID)	[RFC2408]
6	Certificate (CERT)	[RFC2408]
7	Certificate Request (CR)	[RFC2408]
8	Hash (HASH)	[RFC2408]
9	Signature (SIG)	[RFC2408]
10	Nonce (NONCE)	[RFC2408]
11	Notification (N)	[RFC2408]
12	Delete (D)	[RFC2408]
13	Vendor ID (VID)	[RFC2408]
14	Reserved, not to be used	[Dukes]
15	SA KEK Payload (SAK)	[RFC3547][RFC6407]
16	SA TEK Payload (SAT)	[RFC3547][RFC6407]
17	Key Download (KD)	[RFC3547]
18	Sequence Number (SEQ)	[RFC3547]
19	Proof of Possession (POP)	[RFC3547]
20	NAT Discovery (NAT-D)	[RFC3947]
21	NAT Original Address (NAT-OA)	[RFC3947]
22	Group Associated Policy (GAP)	[RFC6407]
23-127	Unassigned
128-255	Reserved for private use

Notify Message Types

Reference: [RFC2408][RFC9395]
Available Formats: CSV

Range	Registration Procedures	Note
1 - 8191	Registry closed	Error types
8192 - 16383	Registry closed	Doi-Specific Error types
16384 - 24575	Registry closed	Status types RESERVED
24576 - 32767	Registry closed	DOI-specific Status codes
32768 - 40959	Registry closed	Private Use
40960 - 65535	Registry closed	RESERVED

Notify Messages - Error Types (1-8191)

Registration Procedure(s)

Registry closed

Reference

[RFC2408][RFC9395]

Available Formats: CSV

Value	Nofity Messages - Error Types	Reference
1	INVALID-PAYLOAD-TYPE	[RFC2408]
2	DOI-NOT-SUPPORTED	[RFC2408]
3	SITUATION-NOT-SUPPORTED	[RFC2408]
4	INVALID-COOKIE	[RFC2408]
5	INVALID-MAJOR-VERSION	[RFC2408]
6	INVALID-MINOR-VERSION	[RFC2408]
7	INVALID-EXCHANGE-TYPE	[RFC2408]
8	INVALID-FLAGS	[RFC2408]
9	INVALID-MESSAGE-ID	[RFC2408]
10	INVALID-PROTOCOL-ID	[RFC2408]
11	INVALID-SPI	[RFC2408]
12	INVALID-TRANSFORM-ID	[RFC2408]
13	ATTRIBUTES-NOT-SUPPORTED	[RFC2408]
14	NO-PROPOSAL-CHOSEN	[RFC2408]
15	BAD-PROPOSAL-SYNTAX	[RFC2408]
16	PAYLOAD-MALFORMED	[RFC2408]
17	INVALID-KEY-INFORMATION	[RFC2408]
18	INVALID-ID-INFORMATION	[RFC2408]
19	INVALID-CERT-ENCODING	[RFC2408]
20	INVALID-CERTIFICATE	[RFC2408]
21	CERT-TYPE-UNSUPPORTED	[RFC2408]
22	INVALID-CERT-AUTHORITY	[RFC2408]
23	INVALID-HASH-INFORMATION	[RFC2408]
24	AUTHENTICATION-FAILED	[RFC2408]
25	INVALID-SIGNATURE	[RFC2408]
26	ADDRESS-NOTIFICATION	[RFC2408]
27	NOTIFY-SA-LIFETIME	[RFC2408]
28	CERTIFICATE-UNAVAILABLE	[RFC2408]
29	UNSUPPORTED-EXCHANGE-TYPE	[RFC2408]
30	UNEQUAL-PAYLOAD-LENGTHS	[RFC2408]
31-8191	RESERVED (Future Use)

Notify Messages - Status Types (16384-24575)

Registration Procedure(s)

Registry closed

Reference

[RFC2408][RFC9395]

Available Formats

CSV

Value	Nofity Messages - Status Types	Reference
16384	CONNECTED	[RFC2408]
16385-24575	RESERVED (Future Use)

Original Source | Taken Source