Autonomous system
AS20057 ATT-MOBILITY-LLC-AS20057
Mobile ARIN
Summary
AT&T Mobility
isp mobile eyeball
AT&T Mobility — the mobile/wireless arm of AT&T and one of the three big US carriers. This ASN carries cellular traffic; AT&T's fixed/residential network is AS7018.
What it's used for
- Mobile data and voice for tens of millions of US wireless subscribers.
Notable
- A large "eyeball" network — addresses here are typically phones and other mobile devices, usually behind carrier-grade NAT, so one public IP maps to many users.
- Competes with Verizon Wireless and T-Mobile US in the three-carrier US market.
Interesting
- AT&T split much of its media ambitions back out (DirecTV, WarnerMedia) to refocus on connectivity, with mobile and fibre as the core business.
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 4 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS7018 | AT&T Enterprises, LLC | 90,342 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1,168 prefixes · 3.98M addresses IPv6 121 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1,289 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS20057- Registry name
- ATT-MOBILITY-LLC-AS20057
- Registrant
- AT&T Enterprises, LLC
- Abuse contact
- abuse@att.net
- Registered
- 2001-03-20
- Last changed
- 2025-03-18
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 89% valid · 1,447 valid, 163 with no ROA 21 RPKI-invalid
- ROAs
- 1,018 authorising AS20057
- ASPA
- 1 declared providers
- IRR
- 89% registered · 1,450 of 1,631 announcements 1 other origin
- Route objects
- 1,019 naming AS20057
Reputation
Classification and threat
Mobile Cellular carrier. Addresses are shared by many handsets via CGNAT.
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: 432 networks and 1,768 prefixes, as published 2026-10-12. 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