Autonomous system
AS5671 PBI-NET-BLK
Unclassified ARIN
Summary
AT&T Enterprises
enterprise isp legacy
PBI-NET-BLK is one of a pair of ASNs — with AS5672 — held by AT&T Enterprises, LLC. The handle is short for Pacific Bell Internet, the ISP arm of the California telco that was folded into SBC and then AT&T.
What it's used for
- Announcing legacy
198.225.0.0space plus a block of dedicated-access addresses, which reverse-resolve underded.swbell.net— the naming AT&T uses for dedicated business circuits rather than consumer lines.
Notable
- The address space serves AT&T's business customers, so this is closer to an enterprise-access network than to a residential eyeball one.
- Both AS5671 and AS5672 were registered to Pacific Bell in 1995 and were carried intact through the SBC and AT&T mergers, which is why two adjacent low ASNs share an identical name and organisation today.
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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 8.45K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 7 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5671- Registry name
- PBI-NET-BLK
- Registrant
- AT&T Enterprises, LLC
- Abuse contact
- abuse@att.net
- Registered
- 1995-08-10
- Last changed
- 2024-12-05
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 4 with no ROA
- ROAs
- 0 authorising AS5671
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 4 announcements
- Route objects
- 0 naming AS5671
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: 445 networks and 1,817 prefixes, as published 2026-10-27. 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