ASN Lookup Tool

AT&T Enterprises, LLC semail.att.com US US 1617 Routes

AS Data

AS20057

AS20057 – AT&T Enterprises, LLC

AS Number 20057
AS Name ATT-MOBILITY-LLC-AS20057
Organization AT&T Enterprises, LLC(ael-360)
Country US
Website semail.att.com
Number of IPv4 Routes 1456
Number of IPv6 Routes 161
ASN type ISP
Registry ARIN
Date Allocated 2001-03-20

ASN Intelligence API for production workflows

Use ASN data for AS20057 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
107.89.104.0/22 1024
166.186.2.0/23 512
107.241.165.0/24 256
166.219.42.0/24 256
107.80.196.0/24 256
166.171.192.0/18 16384
166.131.228.0/24 256
166.131.168.0/23 512
107.241.100.0/22 1024
166.193.40.0/23 512

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       20057
ASName:         ATT-MOBILITY-LLC-AS20057
ASHandle:       AS20057
RegDate:        2001-03-20
Updated:        2025-03-18    
Ref:            https://rdap.arin.net/registry/autnum/20057



OrgName:        AT&T Enterprises, LLC
OrgId:          AEL-360
Address:        208 S. Akard St.
City:           Dallas
StateProv:      TX
PostalCode:     75202
Country:        US
RegDate:        2024-11-22
Updated:        2025-10-29
Ref:            https://rdap.arin.net/registry/entity/AEL-360


OrgTechHandle: ZS44-ARIN
OrgTechName:   IPAdmin-ATT Internet Services
OrgTechPhone:  +1-888-510-5545 
OrgTechEmail:  ipadmin@semail.att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ZS44-ARIN

OrgAbuseHandle: ABUSE7-ARIN
OrgAbuseName:   abuse
OrgAbusePhone:  +1-919-319-8167 
OrgAbuseEmail:  abuse@att.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE7-ARIN

OrgRoutingHandle: ROUTI59-ARIN
OrgRoutingName:   Routing POC
OrgRoutingPhone:  +1-999-999-9999 
OrgRoutingEmail:  DL-routing_poc@att.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI59-ARIN

OrgTechHandle: ICC-ARIN
OrgTechName:   IP Team
OrgTechPhone:  +1-888-876-2382 
OrgTechEmail:  rm-ipspecialist@att.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ICC-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number Description Country
AS64011 NULL ORG AU
AS7018 AT&T Enterprises, LLC US
AS64011 APNIC ASN block AU

Upstreams

AS Number Description Country
AS7018 AT&T Enterprises, LLC US

Downstreams

AS Number Description Country
AS64011 NULL ORG AU

Contacts

Email Contacts

DL-routing_poc@att.com ipadmin@semail.att.com rm-ipspecialist@att.com

Abuse Contacts

abuse@att.net

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Frequently Asked Questions

ASN AS20057 is an Autonomous System Number used to identify a network for BGP internet routing.
AS20057 is listed under AT&T Enterprises, LLC.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.