Data as of Nov 11, 2026

166.203.136.0/24

1 residential-proxy exit · 30 days

AT&T Enterprises, LLC

Announcement

166.203.128.0/20

RPKI valid

Announced by

AS20057

Type

Mobile

Risk

10 / 100 · Low

Shared address

Residential-proxy exits

Proxy exits

0.39% of its addresses · 30 days

Providers

selling exits here

Oct 12, 2026 – Nov 10, 2026

Exits seen per day

2 observations

Proxy providers listing exits

CliProxy
IPPeak

Announcements

Less specific

Covering announcements

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

Network & registry

Announcement Routing history RPKI & IRR Whois & abuse

Routing timeline

Covering aggregate above, the prefix's own history below

166.203.128.0/20

Routing history

Pattern: Stable
First seen: Jun 2019
Current origin since: Jun 2019 · 7.4 yr
Origin networks: 1

RPKI

Route origin authorizations

ROA prefix	ASN	Max len	Anchor	Verdict
166.203.128.0/20	AS20057	/20	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

Route objects on 166.203.128.0/20

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