Data as of Nov 6, 2026

12.133.171.0/24

No anonymizer space · no proxy exits in 30 days

UNIVERSAL · space held by AT&T Enterprises, LLC

Announcement

this exact prefix

No RPKI

Announced by

Type

Business

Risk

0 / 100 · Low

Recent change

New origin May 2026

its first announcement on record

Announcements

Less specific

Prefix	Origin	Type	Leased from	Proxy exits	Holder	RPKI
12.128.0.0/9	AS7018	Residential	IP broker Rackdog (part)	5,202 280 always on	AT&T Enterprises, LLC
12.0.0.0/8	AS7018	Residential		13,222 713 always on	AT&T Enterprises, LLC

The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.

Range	Addresses	Netname	Holder	Type	Created	Abuse contact
12.0.0.0/8	16,777,216	ATT	AT&T Enterprises, LLC (AEL-360) · US	Direct Allocation	Aug 23, 1983	abuse@att.net
└ 12.133.171.0/24	256	UNIVERSA26-171	Universal Health Services (C11578598) · US	Reassigned	Apr 24, 2026	abuse@att.net via ATT

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

IPv4 market

Origin network