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Registry included below
| Range | Registration Procedures | Note |
|---|---|---|
| 1-63 | IETF Review | |
| 64-127 | First Come First Served | |
| 128-255 | Reserved for Private Use | IANA does not assign |
| Value | Description | Reference |
|---|---|---|
| 0 | Reserved | [RFC5492] |
| 1 | Multiprotocol Extensions for BGP-4 | [RFC2858] |
| 2 | Route Refresh Capability for BGP-4 | [RFC2918] |
| 3 | Outbound Route Filtering Capability | [RFC5291] |
| 4 | Multiple routes to a destination capability | [RFC3107] |
| 5 | Extended Next Hop Encoding | [RFC5549] |
| 6 | BGP-Extended Message (TEMPORARY - registered 2015-09-30, extension registered 2016-08-15, expires 2017-09-30) | [draft-ietf-idr-bgp-extended-messages] |
| 7 | BGPsec Capability | [RFC-ietf-sidr-bgpsec-protocol-22] |
| 8-63 | Unassigned | |
| 64 | Graceful Restart Capability | [RFC4724] |
| 65 | Support for 4-octet AS number capability | [RFC6793] |
| 66 | Deprecated (2003-03-06) | |
| 67 | Support for Dynamic Capability (capability specific) | [draft-ietf-idr-dynamic-cap] |
| 68 | Multisession BGP Capability | [draft-ietf-idr-bgp-multisession] |
| 69 | ADD-PATH Capability | [RFC7911] |
| 70 | Enhanced Route Refresh Capability | [RFC7313] |
| 71 | Long-Lived Graceful Restart (LLGR) Capability | [draft-uttaro-idr-bgp-persistence] |
| 72 | Unassigned | |
| 73 | FQDN Capability | [draft-walton-bgp-hostname-capability] |
| 74-127 | Unassigned | |
| 128-255 | Reserved for Private Use | [RFC5492] |