AS-991 as-991
An as-set registered in ARIN, maintained by MNT-SB-950. It names 1 AS and 0 sets directly; followed all the way down, it reaches 1 ASes through 0 nested sets.
Members
What AS-991 lists
1 AS and 0 sets, written in the object across every registry that holds it. Sets open their own page.
Expanded
Every AS it reaches
What a filter built from AS-991 would let in: 1 ASes.
Show the 1 ASes
Prefixes
What AS-991 covers
Every route object in the IRR whose origin is one of the 1 ASes it reaches: the prefixes a filter built from AS-991 (with bgpq4, say) would allow. 1 IPv4 and 0 IPv6. Every one is in the IRR API.
1 IPv4 prefix
Registries
Each registry’s copy
ARIN1 membersas-991
| Maintained by | MNT-SB-950 |
| Last modified | 2026-08-14T19:59:35Z |
| Members | AS991 |
| mbrs-by-ref | N |