Home Prefix Lookup166.136.0.0/16

166.136.0.0/16 - AT&T Enterprises (AS20057)

IPv4ARINannouncedAS20057ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC RPKI Valid

CIDR

166.136.0.0/16

IP Version

IPv4

Addresses

65.5K

Mask

/16 (255.255.0.0)

Country

🇺🇸 United States

City

Boston

RIR

ARIN

Status

announced

Allocated

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

Swipe sideways to see all columns →

Prefix	Origin AS	RPKI	IRR	Last Seen
166.136.0.0/16	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	ARIN	2026-10-11

Related Announcements

1 less-specific, 10 more-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
166.136.0.0/15	AS7018 ATT-INTERNET4 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.112.0/22	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.150.0/23	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.162.0/24	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.164.0/22	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.170.0/23	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.173.0/24	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.174.0/23	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.176.0/24	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.192.0/22	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11
166.136.212.0/22	AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC	Valid	-	2026-10-11

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
166.136.0.0/16	AS20057	/24	arin
166.136.0.0/15	AS7018	/15	arin

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS20057	ARIN	MNT-AEL-360	2026-09-01

Transfer History

Registry transfers of 166.136.0.0/16, blocks inside it, or blocks containing it.

166.136.0.0/15Transfer · 2025-04-01
Wireless Data Service Provider Corporation
🇺🇸 US ARIN
→
AT&T Enterprises, LLC
🇺🇸 US ARIN
166.128.0.0/9M&A · 2024-02-28
Service Provider Corporation
🇺🇸 US ARIN
→
Wireless Data Service Provider Corporation
🇺🇸 US ARIN

Date	Resource	From	To	Type
2025-04-01	166.136.0.0/15	Wireless Data Service Provider Corporation 🇺🇸 US ARIN	AT&T Enterprises, LLC 🇺🇸 US ARIN	Transfer
2024-02-28	166.128.0.0/9	Service Provider Corporation 🇺🇸 US ARIN	Wireless Data Service Provider Corporation 🇺🇸 US ARIN	M&A

Origin ASN

AS20057

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

Related Prefixes

Covering prefix

166.136.0.0/15AS7018

More prefixes of AS20057

All prefixes of AS20057 →

Geolocation

Country🇺🇸United StatesUS

RegionMassachusetts

CityBoston

Coordinates42.3601, -71.0589 ↗

Learn more

RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
RPKI validatorCheck ROA coverage for any prefix or ASN
What is BGP?How prefixes are announced and routed
More-specific prefixesGlossary: covering and more-specific routes
IPv4 transfers in the ARIN regionWho bought and sold address space recently

API

Open

GEThttps://api.ipctl.io/v1/prefix/166.136.0.0/16

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/166.136.0.0/16" | jq

External Links

RIPEstat