AS20057 — ATT-MOBILITY-LLC-AS20057

Network type: mobile

AS20057 announces 146 IPv4 prefixes covering 3,979,776 addresses and 33 IPv6 prefixes.

About this network

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.

Announced prefixes

• 12.72.0.0/16
• 12.73.0.0/17
• 66.102.186.0/24
• 107.72.162.0/23
• 107.72.164.0/23
• 107.72.174.0/24
• 107.72.176.0/23
• 107.72.178.0/24
• 107.72.225.0/24
• 107.77.64.0/19
• 107.77.96.0/23
• 107.77.100.0/22
• 107.77.104.0/21
• 107.77.192.0/24
• 107.77.194.0/23
• 107.77.196.0/22
• 107.77.200.0/21
• 107.77.224.0/21
• 107.77.232.0/22
• 107.77.236.0/23
• 107.80.0.0/22
• 107.80.4.0/23
• 107.80.7.0/24
• 107.80.8.0/21
• 107.80.16.0/20
• 107.80.32.0/19
• 107.80.64.0/18
• 107.80.128.0/17
• 107.81.0.0/16
• 107.84.0.0/17
• 107.84.128.0/20
• 107.84.144.0/21
• 107.84.153.0/24
• 107.84.154.0/23
• 107.84.156.0/22
• 107.84.160.0/19
• 107.84.192.0/18
• 107.85.0.0/16
• 107.87.0.0/17
• 107.87.136.0/22
• 107.87.144.0/21
• 107.87.152.0/23
• 107.87.154.0/24
• 107.87.192.0/18
• 107.89.0.0/16
• 107.90.0.0/15
• 107.92.0.0/17
• 107.92.184.0/21
• 107.92.192.0/18
• 107.93.0.0/17
• 107.93.128.0/18
• 107.94.128.0/24
• 107.94.248.0/22
• 107.95.112.0/24
• 107.106.0.0/15
• 107.112.215.0/24
• 107.118.0.0/16
• 107.125.128.0/17
• 107.126.128.0/17
• 107.127.128.0/17
• 107.233.0.0/16
• 107.234.0.0/15
• 107.241.0.0/16
• 107.250.0.0/19
• 108.144.128.0/17
• 108.146.0.0/16
• 135.211.200.0/24
• 135.211.206.0/24
• 135.211.216.0/24
• 135.211.221.0/24
• 135.211.232.0/24
• 135.211.237.0/24
• 135.211.248.0/24
• 135.211.254.0/24
• 155.163.0.0/16
• 155.166.0.0/16
• 155.170.0.0/16
• 166.128.0.0/13
• 166.136.0.0/15
• 166.138.160.0/19
• 166.138.192.0/18
• 166.147.64.0/18
• 166.170.0.0/15
• 166.172.0.0/15
• 166.175.0.0/16
• 166.176.0.0/15
• 166.184.0.0/14
• 166.188.66.0/24
• 166.193.0.0/17
• 166.195.0.0/16
• 166.200.0.0/14
• 166.204.0.0/19
• 166.204.32.0/20
• 166.204.48.0/21
• 166.204.56.0/23
• 166.204.58.0/24
• 166.204.60.0/23
• 166.204.63.0/24
• 166.204.64.0/20
• 166.204.80.0/21

and 79 more.

Upstream networks

• AS7018 AT&T Enterprises, LLC

Downstream networks

• AS64011 AS64011

Adjacent networks

• AS7018 AT&T Enterprises, LLC
• AS64011 AS64011