AS7287 — PBI-NET-BLK2

AS7287 announces 241 IPv4 prefixes covering 429,056 addresses and 45 IPv6 prefixes.

About this network

PBI-NET-BLK2 is a legacy Pacific Bell Internet autonomous system, now held by AT&T Enterprises, LLC after the SBC/Pacific Bell/AT&T mergers. Today it originates a large amount of AT&T subscriber address space.

What it's used for

• Announcing hundreds of prefixes — roughly 420,000 IPv4 addresses plus IPv6 — the bulk of which are registered to AT&T Mobility (107.64.0.0/10, 108.144.0.0/13, 166.192.0.0/12, 155.165.0.0/16 and friends).
• Reverse DNS on the mobile ranges resolves to mobile-…​.mycingular.net, the long-standing rDNS suffix for AT&T's wireless data network.
• A smaller share is legacy SBC/Pacific Bell DSL space: some blocks are still named as PPPoX customer IP pools in Southern California.

Notable

• Despite the Pacific Bell handle, this is not a backbone AS — that is AS7018. AS7287 is an eyeball AS: the addresses on it are handset and broadband-subscriber pools, so traffic to it terminates at end users.
• Its only upstream neighbour is AT&T's own AS7018, confirming it as an internal customer-facing AS rather than an independent network.

Interesting

• The handle is a fossil. Pacific Bell Internet was the consumer ISP arm of Pacific Bell, which SBC acquired in 1997; SBC then bought AT&T in 2005 and took its name. The AS number, registered in 1996, outlived all three brands.

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

Announced prefixes

• 12.226.78.0/23
• 64.162.40.0/21
• 64.162.104.0/21
• 64.162.240.0/21
• 65.5.2.0/23
• 65.5.5.0/24
• 65.5.6.0/23
• 65.5.8.0/23
• 65.5.133.0/24
• 65.5.134.0/23
• 65.65.38.0/23
• 65.65.144.0/23
• 65.65.162.0/23
• 65.65.224.0/23
• 65.67.76.0/23
• 65.67.108.0/23
• 65.67.170.0/23
• 65.67.238.0/23
• 65.67.252.0/23
• 68.95.200.0/21
• 70.143.128.0/19
• 76.206.116.0/24
• 76.206.119.0/24
• 76.206.120.0/22
• 76.206.124.0/24
• 76.206.126.0/23
• 76.229.32.0/20
• 76.253.193.0/24
• 76.253.194.0/23
• 76.253.196.0/22
• 76.253.200.0/21
• 99.136.160.0/20
• 99.159.176.0/20
• 107.77.112.0/20
• 107.88.185.0/24
• 107.88.186.0/23
• 107.88.188.0/24
• 107.103.104.0/22
• 107.103.108.0/23
• 107.103.111.0/24
• 107.103.114.0/24
• 107.103.121.0/24
• 107.103.122.0/23
• 107.103.124.0/23
• 107.103.127.0/24
• 107.112.128.0/18
• 107.117.60.0/23
• 107.117.64.0/19
• 107.117.112.0/21
• 107.119.24.0/21
• 107.119.96.0/24
• 107.119.100.0/22
• 107.119.104.0/23
• 107.119.106.0/24
• 107.119.130.0/24
• 107.119.138.0/24
• 107.119.143.0/24
• 107.119.146.0/23
• 107.119.148.0/22
• 107.119.152.0/21
• 107.119.160.0/21
• 107.119.168.0/22
• 107.119.174.0/23
• 107.119.176.0/21
• 107.119.188.0/22
• 107.119.192.0/21
• 107.119.200.0/23
• 107.119.205.0/24
• 107.119.206.0/23
• 107.119.208.0/22
• 107.119.214.0/23
• 107.119.216.0/22
• 107.119.220.0/23
• 107.121.76.0/22
• 107.121.80.0/24
• 107.121.148.0/22
• 107.121.156.0/22
• 107.121.166.0/23
• 107.121.168.0/22
• 107.121.178.0/23
• 107.121.184.0/22
• 107.121.208.0/22
• 107.121.212.0/24
• 107.121.218.0/24
• 107.121.222.0/23
• 107.121.225.0/24
• 107.121.226.0/23
• 107.121.237.0/24
• 107.121.238.0/24
• 107.121.240.0/21
• 107.123.64.0/24
• 107.123.67.0/24
• 107.123.68.0/22
• 107.123.72.0/22
• 107.123.76.0/23
• 107.123.78.0/24
• 107.124.4.0/24
• 107.124.7.0/24
• 107.124.8.0/21
• 107.124.16.0/23

and 186 more.

Upstream networks

• AS7018 AT&T Enterprises, LLC

Downstream networks

• AS13965 AT&T Enterprises, LLC
• AS5671 AT&T Enterprises, LLC

Adjacent networks

• AS7018 AT&T Enterprises, LLC
• AS13965 AT&T Enterprises, LLC
• AS5671 AT&T Enterprises, LLC