Data as of Nov 15, 2026

204.97.157.0/24

Anonymizer · ISP proxy

RCN · space held by Cogent Communications, LLC

Announcement

204.97.144.0/20

No RPKI

Announced by

AS6079

Type

ISP proxy

Risk

90 / 100 · Critical

IPv4 market

Path

1 · Holder

Cogent Communications, LLC

record created Jul 13, 1994

2 · Leased from

Rackdog

for its owner Cogent Communications, LLC

3 · Announced by

AS6079 RCN

since Aug 2025 · 15 mo ago

4 · Use

ISP proxy

anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

Name	In 204.97.157.0/24	/24s
Rackdog	256100%	1

Leased from

Owners leasing their own space

Name	In 204.97.157.0/24	/24s
Cogent Communications, LLC	256100%	1

Announcements

Less specific

Covering announcements

Prefix	Origin	Type	Leased from	Proxy exits	Holder	RPKI
204.97.128.0/18 since Jul 2026	AS22773	ISP proxy	IP broker Rackdog	1	Cogent Communications, LLC
204.96.0.0/15 since May 2024	AS174	Internet provider		1	Cogent Communications, LLC

Registrations in this block

The registry's network records over this block, widest first, each under its parent.

Range	Addresses	Netname	Holder	Type	Created	Abuse contact
204.94.0.0 - 204.97.255.255	262,144	COGC	Cogent Communications, LLC (COGC) · US	Direct Allocation	Jul 13, 1994	abuse@cogentco.com
└ 204.97.128.0/18	16,384	RACKDOG-CGNT-NET-35	RCN (C11605230) · US	Reassigned	May 27, 2026	abuse@cogentco.com via COGC

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

Network & registry

Announcement Routing history RPKI & IRR Whois & abuse

Routing timeline

Covering aggregate above, the prefix's own history below

204.97.144.0/20

Routing history

Pattern: Stable
First seen: Aug 2025
Current origin since: Aug 2025 · 1.2 yr
Origin networks: 1