Autonomous system
AS11712 BELLSOUTH
Unclassified ARIN
Summary
AT&T Services (BellSouth)
enterprise legacy
BELLSOUTH is one of the surviving BellSouth autonomous systems, held today by AT&T Services, Inc. ARIN registered the ASN in November 1998 and the org record now points at AT&T's Enterprise IP Group in Indianapolis. Despite the famous name, this is not one of AT&T's big eyeball or backbone ASes.
What it's used for
The routing table is the whole story. RIS sees six IPv4 prefixes and 30,976 addresses on this AS, with two observed neighbours and no IPv6. A tier-1 carrier's transit AS peers with hundreds to thousands of networks; two neighbours means this AS is a leaf hanging off AT&T's own backbone, carrying an internal estate rather than customers or transit. The prefixes are the old BellSouth 139.76 blocks plus a pair of 72.157 /21s.
The registrant list matches: the 139.76 space is registered straight to BELLSOUTH / AT&T Services, and the two 72.157 /21s carry AT&T's internal SWIP naming (BLS-72-157-240-0-…, org "BMF BPRG Equipment BRIC - BHM" and "… CRIC - CLT"). Those are AT&T-internal equipment allocations tagged by site code, not third parties — exactly the intra-group registrant pattern that must not be mistaken for leased space.
Notable
The name is a trap worth flagging. AS11712 wears the BELLSOUTH handle, but the space behind it is a small, internally-scoped estate inside AT&T, not the consumer DSL and fibre footprint people associate with the BellSouth brand. Classifying this AS from its handle rather than its routing would put a couple of dozen thousand addresses in the wrong bucket entirely.
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 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 30.98K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 5 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11712- Registry name
- BELLSOUTH
- Registrant
- AT&T Services, Inc.
- Abuse contact
- abuse@att.net
- Registered
- 1998-11-23
- Last changed
- 2013-12-10
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 6 with no ROA
- ROAs
- 0 authorising AS11712
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 6 announcements
- Route objects
- 0 naming AS11712
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: 442 networks and 1,779 prefixes, as published 2026-10-22. 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