Autonomous system
AS7287 PBI-NET-BLK2
Unclassified ARIN
Summary
AT&T (Pacific Bell Internet legacy AS)
isp mobile eyeball legacy
PBI-NET-BLK2 is a legacy Pacific Bell Internet autonomous system, now held by AT&T Enterprises, LLC after the SBC/Pacific Bell/AT&T mergers. Today it originates a large amount of AT&T subscriber address space.
What it's used for
- Announcing hundreds of prefixes — roughly 420,000 IPv4 addresses plus IPv6 — the bulk of which are registered to AT&T Mobility (
107.64.0.0/10,108.144.0.0/13,166.192.0.0/12,155.165.0.0/16and friends). - Reverse DNS on the mobile ranges resolves to
mobile-….mycingular.net, the long-standing rDNS suffix for AT&T's wireless data network. - A smaller share is legacy SBC/Pacific Bell DSL space: some blocks are still named as PPPoX customer IP pools in Southern California.
Notable
- Despite the Pacific Bell handle, this is not a backbone AS — that is AS7018. AS7287 is an eyeball AS: the addresses on it are handset and broadband-subscriber pools, so traffic to it terminates at end users.
- Its only upstream neighbour is AT&T's own AS7018, confirming it as an internal customer-facing AS rather than an independent network.
Interesting
- The handle is a fossil. Pacific Bell Internet was the consumer ISP arm of Pacific Bell, which SBC acquired in 1997; SBC then bought AT&T in 2005 and took its name. The AS number, registered in 1996, outlived all three brands.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 1 downstream and 3 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7018 | AT&T Enterprises, LLC | 30,280 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 292 prefixes · 425K addresses IPv6 133 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 425 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS7286- Registry name
- PBI-NET-BLK2
- Registrant
- AT&T Enterprises, LLC
- Abuse contact
- abuse@att.net
- Registered
- 1996-11-01
- Last changed
- 2024-12-05
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 95% valid · 557 valid, 28 with no ROA
- ROAs
- 527 authorising AS7287
- ASPA
- 1 declared providers
- IRR
- 88% registered · 515 of 585 announcements
- Route objects
- 476 naming AS7287
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,775 prefixes, as published 2026-10-11. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere