| DH Group # | Group Description | RFC | Recommendation |
|---|---|---|---|
| 1 | 768 bit modulus | RFC 2049 | AVOID Available for use in IKEv1 * IKEv2 |
| 2 | 1024 bit modulus | RFC 2049 | AVOID Available for use in IKEv1 * IKEv2 |
| 3 | EC2N group over GF[2^155] | RFC 2049 | Not available for use in modern IKE implementations. |
| 4 | EC2N group over GF[2^185] | RFC 2049 | Not available for use in modern IKE implementations. |
| 5 | 1536 bit modulus | RFC 3526 | AVOID Available for use in IKEv1 * IKEv2 |
| 6 | EC2N group over GF[2^163] | IETF Draft | Not available for use in modern IKE implementations. |
| 7 | EC2N group over GF[2^163] | IETF Draft | AVOID Available for use in IKEv1 |
| 8 | EC2N group over GF[2^283] | IETF Draft | Not available for use in modern IKE implementations. |
| 9 | EC2N group over GF[2^283] | IETF Draft | Not available for use in modern IKE implementations. |
| 10 | EC2N group over GF[2^409] | IETF Draft | Not available for use in modern IKE implementations. |
| 11 | EC2N group over GF[2^409] | IETF Draft | Not available for use in modern IKE implementations. |
| 12 | EC2N group over GF[2^571] | IETF Draft | Not available for use in modern IKE implementations. |
| 13 | EC2N group over GF[2^571] | IETF Draft | Not available for use in modern IKE implementations. |
| 14 | 2048-bit modulus | RFC 3526 | MINIMUM ACCEPTABLE Available for use in IKEv2 |
| 15 | 3072-bit modulus | RFC 3526 | Not available for use in modern IKE implementations. |
| 16 | 4096-bit modulus | RFC 3526 | Not available for use in modern IKE implementations. |
| 17 | 6144-bit modulus | RFC 3526 | Not available for use in modern IKE implementations. |
| 18 | 8192-bit modulus | RFC 3526 | Not available for use in modern IKE implementations. |
| 19 | 256-bit random elliptic curve | RFC 5903 | Available for use in IKEv2 |
| 20 | 384-bit random elliptic curve | RFC 5903 | Available for use in IKEv2 |
| 21 | 521-bit random elliptic curve | RFC 5903 | Available for use in IKEv2 |
| 22 | 1024-bit modulus with 160-bit prime order subgroup | RFC 5114 | Not available for use in modern IKE implementations. |
| 23 | 2048-bit modulus with 224-bit prime order subgroup | RFC 5114 | Not available for use in modern IKE implementations. |
| 24 | 2048-bit modulus with 256-bit prime order subgroup | RFC 5114 | Available for use in IKEv2 |
| 25 | 192-bit Random ECP Group | RFC 5114 | Not available for use in modern IKE implementations. |
| 26 | 224-bit Random ECP Group | RFC 5114 | Not available for use in modern IKE implementations. |
| 27 | 224-bit Random ECP Group | RFC 6932 | Not available for use in modern IKE implementations. |
| 28 | 256-bit Brainpool ECP group | RFC 6932 | Not available for use in modern IKE implementations. |
| 29 | 384-bit Brainpool ECP group | RFC 6932 | Not available for use in modern IKE implementations. |
| 30 | 512-bit Brainpool ECP group | RFC 6932 | Not available for use in modern IKE implementations. |
| 31-32767 | Unassigned | ||