AS7018 — ATT-INTERNET4

Network type: residential

AS7018 announces 7,640 IPv4 prefixes covering 89,986,048 addresses and 207 IPv6 prefixes.

About this network

AT&T's main US network (ATT-INTERNET4) — one of the largest access and backbone networks in the United States.

What it's used for

• Consumer and business fixed broadband (DSL and fibre) and a large national IP backbone; AT&T mobile largely uses separate ASNs.

Notable

• A huge "eyeball" network with one of the biggest IPv4 footprints anywhere.
• As a former Bell System heir, AT&T's network is a spine of US telecommunications.

Interesting

• The AT&T name and network trace back through the breakup and later re-consolidation of the original Bell telephone monopoly.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 12.0.4.0/22
• 12.0.8.0/21
• 12.0.16.0/20
• 12.0.32.0/19
• 12.0.64.0/19
• 12.0.96.0/20
• 12.0.112.0/21
• 12.0.121.0/24
• 12.0.122.0/23
• 12.0.124.0/23
• 12.0.128.0/18
• 12.0.192.0/19
• 12.0.232.0/21
• 12.0.240.0/20
• 12.1.0.0/22
• 12.1.4.0/24
• 12.1.6.0/23
• 12.1.8.0/21
• 12.1.16.0/20
• 12.1.32.0/20
• 12.1.51.0/24
• 12.1.52.0/22
• 12.1.56.0/21
• 12.1.64.0/20
• 12.1.80.0/21
• 12.1.89.0/24
• 12.1.90.0/23
• 12.1.92.0/22
• 12.1.97.0/24
• 12.1.98.0/23
• 12.1.100.0/22
• 12.1.104.0/21
• 12.1.112.0/20
• 12.1.128.0/17
• 12.2.0.0/21
• 12.2.8.0/22
• 12.2.13.0/24
• 12.2.14.0/23
• 12.2.16.0/20
• 12.2.32.0/23
• 12.2.34.0/24
• 12.2.36.0/22
• 12.2.40.0/21
• 12.2.48.0/20
• 12.2.64.0/18
• 12.2.128.0/21
• 12.2.136.0/22
• 12.2.140.0/23
• 12.2.143.0/24
• 12.2.144.0/20
• 12.2.160.0/21
• 12.2.168.0/24
• 12.2.170.0/23
• 12.2.172.0/22
• 12.2.177.0/24
• 12.2.178.0/23
• 12.2.180.0/22
• 12.2.184.0/21
• 12.2.192.0/18
• 12.3.0.0/19
• 12.3.34.0/23
• 12.3.36.0/22
• 12.3.41.0/24
• 12.3.42.0/23
• 12.3.44.0/22
• 12.3.48.0/20
• 12.3.64.0/19
• 12.3.96.0/20
• 12.3.112.0/22
• 12.3.116.0/23
• 12.3.118.0/24
• 12.3.120.0/21
• 12.3.128.0/19
• 12.3.160.0/22
• 12.3.164.0/23
• 12.3.166.0/24
• 12.3.168.0/21
• 12.3.176.0/20
• 12.3.192.0/20
• 12.3.208.0/22
• 12.3.214.0/23
• 12.3.216.0/22
• 12.3.220.0/23
• 12.3.222.0/24
• 12.3.224.0/19
• 12.4.0.0/20
• 12.4.16.0/21
• 12.4.24.0/23
• 12.4.28.0/22
• 12.4.32.0/19
• 12.4.64.0/18
• 12.4.128.0/19
• 12.4.160.0/22
• 12.4.165.0/24
• 12.4.166.0/23
• 12.4.168.0/21
• 12.4.176.0/20
• 12.4.192.0/19
• 12.4.224.0/20
• 12.4.240.0/22

and 7,747 more.

Upstream networks

• AS1299 Arelion Sweden AB
• AS174 Cogent Communications, LLC
• AS6939 Hurricane Electric LLC
• AS3356 Level 3 Parent, LLC
• AS2914 NTT America, Inc.
• AS3257 GTT Communications Inc.
• AS5511 Orange S.A.
• AS3491 PCCW Global (HK) Ltd.
• AS6762 TELECOM ITALIA SPARKLE S.p.A.
• AS3320 Deutsche Telekom AG
• AS2497 Internet Initiative Japan Inc.
• AS6453 TATA COMMUNICATIONS (AMERICA) INC
• AS701 Verizon Business

Downstream networks

• AS20057 AT&T Enterprises, LLC
• AS7287 AT&T Enterprises, LLC
• AS2386 AT&T Enterprises, LLC
• AS16509 Amazon.com, Inc.
• AS14654 AT&T Enterprises, LLC
• AS13693 Vexus Fiber
• AS174 Cogent Communications, LLC
• AS20115 Charter Communications LLC
• AS1906 Northrop Grumman
• AS13335 Cloudflare, Inc.
• AS20940 Akamai International B.V.
• AS3257 GTT Communications Inc.
• AS6389 AT&T Enterprises, LLC
• AS19957 AT&T Enterprises, LLC
• AS714 Apple Inc.
• AS2914 NTT America, Inc.
• AS11520 Allstate Insurance Company
• AS5773 BCN Telecom Inc.
• AS14962 NCR Voyix Corporation
• AS8075 Microsoft Corporation
• AS26675 Region IV Education Service Center
• AS8030 AT&T WorldNet
• AS2687 AT&T Enterprises, LLC
• AS36180 Cisco IoT
• AS15169 Google LLC

Adjacent networks

• AS1299 Arelion Sweden AB
• AS3356 Level 3 Parent, LLC
• AS174 Cogent Communications, LLC
• AS6939 Hurricane Electric LLC
• AS2914 NTT America, Inc.
• AS3491 PCCW Global (HK) Ltd.
• AS6453 TATA COMMUNICATIONS (AMERICA) INC
• AS20057 AT&T Enterprises, LLC
• AS6762 TELECOM ITALIA SPARKLE S.p.A.
• AS3257 GTT Communications Inc.
• AS6461 Zayo Bandwidth
• AS5511 Orange S.A.
• AS4134 No.31,Jin-rong Street
• AS701 Verizon Business
• AS12956 TELEFONICA GLOBAL SOLUTIONS SL
• AS7287 AT&T Enterprises, LLC
• AS2386 AT&T Enterprises, LLC
• AS3320 Deutsche Telekom AG
• AS16509 Amazon.com, Inc.
• AS2497 Internet Initiative Japan Inc.
• AS13335 Cloudflare, Inc.
• AS14654 AT&T Enterprises, LLC
• AS32787 Akamai Technologies, Inc.
• AS15169 Google LLC
• AS7922 Comcast Cable Communications, LLC