AS11712 AT&T Services, Inc.

BELLSOUTH - AT&T Services, Inc. · registered in the United States

IPv4 addresses30,9765 prefixes · <0.001% of announced IPv4

Rank in United States#1,786largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#4,964of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS11712 in ASN lookup Look up an IP in this network (72.157.240.1) All networks in United States

IPv4 prefixes

All 5 prefixes, in address order.

72.157.240.0/20
139.76.8.0/21
139.76.53.0/24
139.76.64.0/18
139.76.224.0/19

Other ASNs named AT&T Services, Inc.

1 other network uses the same organisation name; together with AS11712 they announce 201,728 IPv4 addresses.

ASNNameIPv4 addresses

AS797AMERITECH-AS - AT&T Services, Inc. US170,752

Similar-sized networks in United States

ASNNameIPv4 addresses

AS14297#1783 ACI-WORLDWIDE - ACI Worldwide, Inc.31,232

AS12179#1784 INTERNAP-2BLK - Unitas Global30,976

AS6203#1785 SCIPIO-TECH-6203 - Peace Communications LLC30,976

AS32601#1787 ACUNET-2 - Abilene Christian University30,976

AS397575#1788 ASCENSION-TECHNOLOGIES - Ascension Technologies30,976

AS18501#1789 JOESD-18501 - CyberCloud Professionals LLC30,720

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources