Home ASN LookupAS20057

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

🇺🇸

ARINassignedASPA Published

Announced Prefixes (BGP)

1,642total

1,481 IPv4161 IPv6

IPv4 Addresses

Allocated (RIR)327,680

Announced (BGP)7.3M

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)7.2×10²⁸

Prefix Limit (IPv4)

5,000

Prefix Limit (IPv6)

500

Country

🇺🇸 US

RIR

ARIN

Status

assigned

Allocated

2001-03-20

Routing hygiene

Score 17/100 · Low risk

RPKI ROA coverage

88.1%

32 prefixes RPKI invalid

IRR route objects

88.4%

28 prefixes registered for another origin

Hijack signals

0 announced against others' ROAs, 4 own announced by others

Upstreams

diversity 0/100

Only one upstream seen in the AS paths of its routes
12% of announced prefixes (195 of 1642) have no valid ROA, 32 of them RPKI invalid

Based on 1,642 announced prefixes, updated daily (2026-10-26). How the score works · RPKI explained

Announced Prefixes

(BGP)1,000 of 1,642

Prefix	RPKI	IRR	Last Seen
12.72.0.0/17	Valid	ARIN	-
12.72.0.0/19	Valid	ARIN	-
12.72.32.0/21	Valid	ARIN	-
12.72.40.0/21	Valid	ARIN	-
12.72.48.0/21	Valid	ARIN	-
12.72.56.0/21	Valid	ARIN	-
12.72.64.0/22	Valid	ARIN	-
12.72.68.0/22	Valid	ARIN	-
12.72.72.0/22	Valid	ARIN	-
12.72.76.0/23	Valid	ARIN	-

1-10 of 1,000

1 / 100

Allocated Prefixes

(RIR)5

Prefix	Country	RIR	Status
155.163.0.0/16	🇺🇸 US	ARIN	allocated
155.166.0.0/16	🇺🇸 US	ARIN	allocated
155.170.0.0/16	🇺🇸 US	ARIN	allocated
166.183.0.0/16	🇺🇸 US	ARIN	allocated
166.220.0.0/16	🇺🇸 US	ARIN	allocated

All 1,642 announced prefixes of AS20057 →

Upstream Providers(1)

ASN	Name
AS7018	🇺🇸ATT-INTERNET4 - AT&T Enterprises, LLC

BGP Neighbours

(seen in AS paths)

Upstreams (1)

Networks AS20057 hands its own prefixes to: transit providers, or peers at an exchange.

AS7018AT&T Enterprises1,642

Downstreams (1)

Networks whose own prefixes AS20057 passes on: usually its customers.

AS64011-58

Transfer History

Registry transfers of AS20057 between organisations.

AS20057M&A · 2025-03-18
AT&T Mobility LLC
🇺🇸 US ARIN
→
AT&T Enterprises, LLC
🇺🇸 US ARIN

Date	Resource	From	To	Type
2025-03-18	AS20057	AT&T Mobility LLC 🇺🇸 US ARIN	AT&T Enterprises, LLC 🇺🇸 US ARIN	M&A

ASPA

Published1 upstream, 0 downstreams

Authorized Upstream Providers

AS7018

Expires 2026-10-28

View full ASPA details →

External Links

ARIN Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
How to run an ASPA checkVerify the upstream providers listed above
IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/20057

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/20057" | jq