AS20057 AT&T Enterprises, LLC

ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC · registered in the United States

IPv4 addresses3,979,7761,168 prefixes · 0.127% of announced IPv4

Rank in United States#43largest network in US by IPv4 space, of 18,338 · 0.29% of US

Rank worldwide#124of 79,396 networks with IPv4

IPv647,544 x /48121 prefixes

CountryUnited States18,679 ASNs registered there

Open AS20057 in ASN lookup Look up an IP in this network (12.72.0.1) All networks in United States

IPv4 prefixes

First 500 of 1,168 prefixes, in address order.

12.72.0.0/18
12.72.64.0/20
12.72.80.0/22
12.72.84.0/23
12.72.86.0/24
12.72.87.0/24
12.72.88.0/21
12.72.96.0/20
12.72.112.0/22
12.72.116.0/23
12.72.118.0/23
12.72.120.0/22
12.72.124.0/23
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12.72.127.0/24
12.72.128.0/23
12.72.130.0/24
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12.72.132.0/24
12.72.133.0/24
12.72.134.0/23
12.72.136.0/21
12.72.144.0/21
12.72.152.0/21
12.72.160.0/20
12.72.176.0/20
12.72.192.0/19
12.72.224.0/20
12.72.240.0/21
12.72.248.0/22
12.72.252.0/23
12.72.254.0/23
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
107.80.0.0/23
107.80.2.0/24
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107.80.8.0/21
107.80.16.0/20
107.80.32.0/19
107.80.64.0/20
107.80.80.0/20
107.80.96.0/19
107.80.128.0/24
107.80.129.0/24
107.80.130.0/23
107.80.132.0/22
107.80.136.0/22
107.80.140.0/23
107.80.142.0/24
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107.80.144.0/23
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107.80.156.0/22
107.80.160.0/19
107.80.192.0/22
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107.80.199.0/24
107.80.200.0/21
107.80.208.0/22
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107.80.232.0/22
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107.80.240.0/21
107.80.248.0/23
107.80.250.0/24
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107.80.252.0/23
107.80.254.0/23
107.81.0.0/16
107.84.0.0/22
107.84.4.0/22
107.84.8.0/22
107.84.12.0/23
107.84.14.0/24
107.84.15.0/24
107.84.16.0/21
107.84.24.0/22
107.84.28.0/24
107.84.29.0/24
107.84.30.0/23
107.84.32.0/19
107.84.64.0/18
107.84.128.0/20
107.84.144.0/21
107.84.153.0/24
107.84.154.0/24
107.84.155.0/24
107.84.156.0/22
107.84.160.0/20
107.84.176.0/23
107.84.178.0/23
107.84.180.0/22
107.84.184.0/22
107.84.188.0/23
107.84.190.0/24
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107.84.192.0/21
107.84.200.0/24
107.84.201.0/24
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107.84.209.0/24
107.84.210.0/23
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107.84.216.0/21
107.84.224.0/19
107.85.0.0/21
107.85.8.0/21
107.85.16.0/23
107.85.18.0/23
107.85.20.0/22
107.85.24.0/21
107.85.32.0/24
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107.85.36.0/22
107.85.40.0/21
107.85.48.0/21
107.85.56.0/24
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107.85.72.0/22
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107.85.80.0/20
107.85.96.0/21
107.85.104.0/22
107.85.108.0/23
107.85.110.0/24
107.85.111.0/24
107.85.112.0/22
107.85.116.0/23
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107.85.128.0/19
107.85.160.0/20
107.85.176.0/22
107.85.180.0/23
107.85.182.0/24
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107.85.184.0/21
107.85.192.0/19
107.85.224.0/21
107.85.232.0/22
107.85.236.0/23
107.85.238.0/24
107.85.239.0/24
107.85.240.0/20
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
107.89.0.0/22
107.89.4.0/23
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107.89.8.0/21
107.89.16.0/20
107.89.32.0/21
107.89.40.0/21
107.89.48.0/23
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107.89.60.0/24
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107.89.68.0/22
107.89.72.0/21
107.89.80.0/20
107.89.96.0/19
107.89.128.0/18
107.89.192.0/23
107.89.194.0/24
107.89.195.0/24
107.89.196.0/22
107.89.200.0/22
107.89.204.0/24
107.89.205.0/24
107.89.206.0/24
107.89.207.0/24
107.89.208.0/21
107.89.216.0/24
107.89.217.0/24
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107.89.220.0/23
107.89.222.0/23
107.89.224.0/22
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107.89.230.0/23
107.89.232.0/23
107.89.234.0/23
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107.89.240.0/20
107.90.0.0/19
107.90.32.0/21
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107.90.104.0/21
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107.90.120.0/22
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107.90.128.0/23
107.90.130.0/23
107.90.132.0/22
107.90.136.0/21
107.90.144.0/21
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107.90.232.0/21
107.90.240.0/20
107.91.0.0/19
107.91.32.0/21
107.91.40.0/22
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107.91.64.0/24
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107.91.112.0/21
107.91.120.0/24
107.91.121.0/24
107.91.122.0/23
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107.91.128.0/22
107.91.132.0/23
107.91.134.0/23
107.91.136.0/21
107.91.144.0/20
107.91.160.0/19
107.91.192.0/20
107.91.208.0/23
107.91.210.0/23
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107.91.216.0/21
107.91.224.0/19
107.92.0.0/18
107.92.64.0/19
107.92.96.0/20
107.92.112.0/21
107.92.120.0/22
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107.92.184.0/23
107.92.186.0/24
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107.92.188.0/22
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
107.118.0.0/22
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107.118.64.0/19
107.118.96.0/20
107.118.112.0/22
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107.118.128.0/17
107.125.128.0/21
107.125.136.0/22
107.125.140.0/24
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107.126.128.0/22
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107.126.144.0/20
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107.126.176.0/20
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107.127.128.0/22
107.127.132.0/23
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107.127.168.0/22
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107.127.192.0/22
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107.127.198.0/24
107.127.199.0/24
107.127.200.0/21
107.127.208.0/20
107.127.224.0/23
107.127.226.0/23
107.127.228.0/23
107.127.230.0/24
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107.127.232.0/21
107.127.240.0/20
107.233.0.0/16
107.234.0.0/15
107.241.0.0/22
107.241.4.0/24
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107.241.132.0/22
107.241.136.0/21
107.241.144.0/22
107.241.148.0/23
107.241.150.0/24

IPv6 prefixes

All 121 prefixes.

2600:380::/39
2600:380:200::/39
2600:380:400::/38
2600:380:800::/39
2600:380:a00::/39
2600:380:c00::/38
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2600:380:f100::/47
2600:380:f102::/48
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2600:380:f1c0::/44
2600:380:f1d0::/48
2600:380:f1d1::/48
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2600:380:f1f0::/48
2600:380:f1f2::/47
2600:380:f1fa::/48
2600:380:fe00::/39
2600:381::/39
2600:381:200::/39
2600:387::/45
2600:387:8::/46

Other ASNs named AT&T Enterprises, LLC

24 other networks use the same organisation name; together with AS20057 they announce 103,072,004 IPv4 addresses.

ASNNameIPv4 addresses

AS7018ATT-INTERNET4 - AT&T Enterprises, LLC US90,002,688

AS6389BELLSOUTH-NET-BLK - AT&T Enterprises, LLC US4,237,056

AS2686ATGS-MMD-AS - AT&T Enterprises, LLC US1,370,368

AS14654WAYPORT - AT&T Enterprises, LLC US916,480

AS2687ATGS-MMD-AS - AT&T Enterprises, LLC US727,040

AS7287PBI-NET-BLK2 - AT&T Enterprises, LLC US420,864

AS2688ATGS-MMD-AS - AT&T Enterprises, LLC US345,600

AS19957STATE-OF-TENNESSEE-NETTN - AT&T Enterprises, LLC US291,072

AS2386INS-AS - AT&T Enterprises, LLC US272,128

AS6431ATT-RESEARCH - AT&T Enterprises, LLC US200,192

AS4185ATTIS-ASN4185 - AT&T Enterprises, LLC US131,328

AS2685ATGS-MMD-AS - AT&T Enterprises, LLC US94,464

AS25993ATT-LABS-AUSTIN-TX - AT&T Enterprises, LLC US44,288

AS4473ATTIS-ASN4473 - AT&T Enterprises, LLC US12,800

AS5671PBI-NET-BLK - AT&T Enterprises, LLC US8,448

AS5672PBI-NET-BLK - AT&T Enterprises, LLC US5,376

AS13965SBCIS-FYTVAR - AT&T Enterprises, LLC US4,096

AS3423ATTIS-ASN3423 - AT&T Enterprises, LLC US3,328

AS4468EASYLINK4 - AT&T Enterprises, LLC US1,536

AS6269ATT-INTERNET2 - AT&T Enterprises, LLC US1,280

AS7291SBIS-BLK - AT&T Enterprises, LLC US1,024

AS5728WORLDNET1 - AT&T Enterprises, LLC US512

AS4466EASYLINK2 - AT&T Enterprises, LLC US256

AS13979ATT-IPFR - AT&T Enterprises, LLC US4

Similar-sized networks in United States

ASNNameIPv4 addresses

AS16625#40 AKAMAI-AS - Akamai Technologies, Inc.4,118,016

AS3257#41 GTT-BACKBONE GTT Communications Inc.4,103,936

AS11003#42 PANDG - The Procter and Gamble Company4,090,624

AS36351#44 SOFTLAYER - IBM Cloud3,642,112

AS4249#45 LILLY-AS - Eli Lilly and Company3,342,336

AS14061#46 DIGITALOCEAN-ASN - DigitalOcean, LLC3,150,845

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