Data as of Nov 3, 2026

166.203.196.0/22

No anonymizer space · no proxy exits in 30 days

AT&T Enterprises, LLC

Announcement

this exact prefix

RPKI valid

Announced by

Type

Mobile

Risk

10 / 100 · Low

Shared address

Announcements

Less specific

Prefix	Origin	Type	Proxy exits	Holder
166.203.128.0/17 since Oct 2015	AS20057	Mobile	3	AT&T Enterprises, LLC
166.203.0.0/16 since Sep 2019	AS20057	Mobile	3	AT&T Enterprises, LLC
166.200.0.0/14 since Aug 2026	AS7018	Residential	3	AT&T Enterprises, LLC

Origin network

RPKI

ROA prefix	ASN	Max len	Anchor	Verdict
166.203.196.0/22	AS20057	/22	ARIN	RPKI valid
166.203.128.0/17	AS20057	/17	ARIN	Too specific
166.203.0.0/16	AS20057	/16	ARIN	Too specific
166.200.0.0/14	AS7018	/14	ARIN	Another network

IRR

Origin	Registry	Description	Maintainer	Modified
AS20057	ARIN	AT&T Enterprises, LLC	MNT-AEL-360	Sep 15, 2026