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AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC

Everything the routing table and the registries say about AS20057: who holds it, which registry issued it, and which address blocks it advertises.

Mobile carriersAS20057

1474 IPv4 and 161 IPv6 prefixes announced.

Registry facts

Refreshed daily
AS number
AS20057
Holder
ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC
Country
US
Regional registry
ARIN — American Registry for Internet Numbers
Registry block
18432-20479 (IANA 16-bit Autonomous System (AS) Numbers Registry)
Announced today
Yes
IPv4 prefixes
1474
IPv6 prefixes
161
Observed at
2026-09-05T16:00:00

Data: RIPEstat. Prefix and holder data comes from the RIPEstat Data API and is cached for 24 hours. The regional registry is derived from the IANA AS number allocation table. Authoritative registry records are served by ARIN RDAP.

Announced prefixes

1474 IPv4 · 161 IPv6
  • 100 IPv4 shown
  • 100 IPv6 shown
  • 12.72.0.0/17
  • 12.72.0.0/19
  • 12.72.32.0/21
  • 12.72.40.0/21
  • 12.72.48.0/21
  • 12.72.56.0/21
  • 12.72.64.0/22
  • 12.72.68.0/22
  • 12.72.72.0/22
  • 12.72.76.0/23
  • 12.72.82.0/23
  • 12.72.86.0/24
  • 12.72.88.0/23
  • 12.72.90.0/23
  • 12.72.92.0/22
  • 12.72.96.0/22
  • 12.72.100.0/23
  • 12.72.102.0/24
  • 12.72.104.0/21
  • 12.72.113.0/24
  • 12.72.114.0/23
  • 12.72.116.0/23
  • 12.72.119.0/24
  • 12.72.120.0/24
  • 12.72.122.0/24
  • 12.72.123.0/24
  • 12.72.126.0/24
  • 12.72.128.0/17
  • 12.72.128.0/24
  • 12.72.129.0/24
  • 12.72.130.0/24
  • 12.72.132.0/24
  • 12.72.134.0/23
  • 12.72.136.0/21
  • 12.72.144.0/21
  • 12.72.160.0/20
  • 12.72.192.0/19
  • 12.72.224.0/20
  • 12.72.240.0/21
  • 12.72.248.0/24
  • 12.72.251.0/24
  • 12.72.252.0/24
  • 12.72.253.0/24
  • 12.73.0.0/17
  • 12.73.0.0/19
  • 12.73.32.0/19
  • 12.73.64.0/18
  • 66.102.186.0/24
  • 70.144.0.0/18
  • 107.72.162.0/24
  • 107.72.163.0/24
  • 107.72.164.0/24
  • 107.72.165.0/24
  • 107.72.174.0/24
  • 107.72.176.0/24
  • 107.72.177.0/24
  • 107.72.178.0/24
  • 107.72.225.0/24
  • 107.77.64.0/24
  • 107.77.65.0/24
  • 107.77.66.0/24
  • 107.77.67.0/24
  • 107.77.68.0/24
  • 107.77.69.0/24
  • 107.77.70.0/24
  • 107.77.71.0/24
  • 107.77.72.0/24
  • 107.77.73.0/24
  • 107.77.74.0/24
  • 107.77.75.0/24
  • 107.77.76.0/24
  • 107.77.77.0/24
  • 107.77.78.0/24
  • 107.77.79.0/24
  • 107.77.80.0/24
  • 107.77.81.0/24
  • 107.77.82.0/24
  • 107.77.83.0/24
  • 107.77.84.0/24
  • 107.77.85.0/24
  • 107.77.86.0/24
  • 107.77.87.0/24
  • 107.77.88.0/24
  • 107.77.89.0/24
  • 107.77.90.0/24
  • 107.77.91.0/24
  • 107.77.92.0/24
  • 107.77.93.0/24
  • 107.77.94.0/24
  • 107.77.95.0/24
  • 107.77.96.0/24
  • 107.77.97.0/24
  • 107.77.100.0/24
  • 107.77.101.0/24
  • 107.77.102.0/24
  • 107.77.103.0/24
  • 107.77.104.0/24
  • 107.77.105.0/24
  • 107.77.106.0/24
  • 107.77.107.0/24
  • 2600:380::/37
  • 2600:380:1000::/37
  • 2600:380:1180::/41
  • 2600:380:180::/41
  • 2600:380:1800::/38
  • 2600:380:1800::/41
  • 2600:380:1880::/41
  • 2600:380:2000::/37
  • 2600:380:2580::/41
  • 2600:380:2800::/37
  • 2600:380:3000::/37
  • 2600:380:3180::/41
  • 2600:380:3800::/37
  • 2600:380:4000::/38
  • 2600:380:4400::/38
  • 2600:380:4500::/40
  • 2600:380:4700::/41
  • 2600:380:4800::/38
  • 2600:380:4c00::/38
  • 2600:380:4c00::/41
  • 2600:380:4c80::/41
  • 2600:380:4d00::/41
  • 2600:380:4d80::/41
  • 2600:380:5000::/38
  • 2600:380:5300::/41
  • 2600:380:5400::/38
  • 2600:380:5800::/38
  • 2600:380:5800::/41
  • 2600:380:5880::/41
  • 2600:380:5900::/41
  • 2600:380:5980::/41
  • 2600:380:5a00::/41
  • 2600:380:5a80::/41
  • 2600:380:5c00::/38
  • 2600:380:6000::/38
  • 2600:380:6000::/41
  • 2600:380:6080::/41
  • 2600:380:6100::/41
  • 2600:380:6180::/41
  • 2600:380:6200::/41
  • 2600:380:6280::/41
  • 2600:380:6300::/41
  • 2600:380:6380::/41
  • 2600:380:6400::/38
  • 2600:380:6400::/41
  • 2600:380:6480::/41
  • 2600:380:6500::/41
  • 2600:380:6580::/41
  • 2600:380:6600::/41
  • 2600:380:6680::/41
  • 2600:380:6800::/41
  • 2600:380:6900::/40
  • 2600:380:6a00::/40
  • 2600:380:6b00::/40
  • 2600:380:6c00::/38
  • 2600:380:7000::/38
  • 2600:380:7400::/40
  • 2600:380:7400::/41
  • 2600:380:7500::/40
  • 2600:380:7600::/40
  • 2600:380:7600::/41
  • 2600:380:7700::/40
  • 2600:380:7700::/41
  • 2600:380:7800::/40
  • 2600:380:7800::/41
  • 2600:380:7900::/40
  • 2600:380:7900::/41
  • 2600:380:7a00::/40
  • 2600:380:7b00::/40
  • 2600:380:7b00::/41
  • 2600:380:7c00::/38
  • 2600:380:7c00::/41
  • 2600:380:7d00::/40
  • 2600:380:7d00::/41
  • 2600:380:800::/37
  • 2600:380:800::/38
  • 2600:380:8000::/40
  • 2600:380:8400::/40
  • 2600:380:8500::/40
  • 2600:380:8600::/40
  • 2600:380:8700::/40
  • 2600:380:8800::/40
  • 2600:380:8a00::/40
  • 2600:380:8b00::/40
  • 2600:380:8b00::/41
  • 2600:380:8c00::/40
  • 2600:380:8d00::/40
  • 2600:380:8e00::/40
  • 2600:380:9000::/40
  • 2600:380:9100::/40
  • 2600:380:9200::/40
  • 2600:380:9400::/40
  • 2600:380:9500::/40
  • 2600:380:980::/41
  • 2600:380:9800::/40
  • 2600:380:9900::/40
  • 2600:380:9a00::/40
  • 2600:380:9b00::/40
  • 2600:380:9c00::/40
  • 2600:380:9d00::/40

A prefix here is a block this AS was seen originating in BGP, not a block it is guaranteed to own. Announcement and allocation are different facts, and they disagree more often than people expect.

Registry record

arin
FieldValue
ASNumber20057
ASNameATT-MOBILITY-LLC-AS20057
ASHandle20057
RegDate2001-03-20
Refhttps://rdap.arin.net/registry/autnum/20057
sourceARIN
OrgAbuseHandleABUSE7-ARIN
OrgAbuseNameabuse
OrgAbusePhone+1-919-319-8167
OrgAbuseEmailabuse@att.net
OrgAbuseRefhttps://rdap.arin.net/registry/entity/ABUSE7-ARIN
sourceARIN
OrgNameAT&T Enterprises, LLC
OrgIdAEL-360
Address208 S. Akard St.
CityDallas
StateProvTX
PostalCode75202
CountryUS
RegDate2024-11-22
Refhttps://rdap.arin.net/registry/entity/AEL-360
sourceARIN
OrgRoutingHandleROUTI59-ARIN
OrgRoutingNameRouting POC

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