Autonomous system
AS3423 ATTIS-ASN3423 - AT&T Enterprises, LLC
Unclassified ARIN
Summary
AT&T Enterprises, LLC
enterprise legacy
ATTIS-ASN3423 is held by AT&T Enterprises, LLC, the entity that holds AT&T's ARIN registrations. It is one of many AT&T AS numbers, and a small one: its announced footprint is a few thousand IPv4 addresses.
What it's used for
- Part of AT&T's wider ASN estate, alongside its main backbone AS AS7018.
- A limited set of prefixes rather than a broad consumer or backbone network, which points to internal or specific-service use rather than mass eyeball broadband.
Notable
- Large carriers accumulate dozens of AS numbers through decades of mergers, acquisitions, and separate business units. Not all of them carry meaningful traffic volume.
- The
ATTIShandle and the low number both date the registration to the mid 1990s, well before AT&T's modern network took its present shape.
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, 0 downstream and 4 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7018 | AT&T Enterprises, LLC | 475 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9 prefixes · 3.33K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 10 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS3423- Registry name
- ATTIS-ASN3423
- Registrant
- AT&T Enterprises, LLC
- Abuse contact
- abuse@att.net
- Registered
- 1994-02-17
- Last changed
- 2024-12-05
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 9 with no ROA
- ROAs
- 27 authorising AS3423
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 9 announcements
- Route objects
- 25 naming AS3423
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: 453 networks and 1,846 prefixes, as published 2026-11-11. 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