asn.dev

Autonomous system

AS20057 ATT-MOBILITY-LLC-AS20057

Mobile ARIN

IPv4 addresses 4.05M 1,182 prefixes
IPv6 prefixes 121 counted as prefixes, not addresses
Countries 1 mostly US
Flagged prefixes 0 none

Summary

AT&T Mobility

United States · AI-generated

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](https://asn.ipinfo.app/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.

Address space

Summary

Full explorer
CountryNamePrefixes
USUnited States of America1,303

Registry

Allocation record

via ARIN RDAP
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
Status
active

Reputation

Classification and threat

Mobile Cellular carrier. Addresses are shared by many handsets via CGNAT.

No IC3 indicators Nothing from the FBI IC3 feed.

Threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check