204.97.128.0/20

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 204.97.128.0/20	/24s
Rackdog	4,096100%	16

Leased from

Owners leasing their own space

Name	In 204.97.128.0/20	/24s
Cogent Communications, LLC	4,096100%	16

Lineage

How this block came to its use, oldest first. The whole IPv4 market →

204.97.128.0/20

From the registry to its use

Jul 13, 1994
Registry record
Cogent Communications, LLC
Direct Allocation (legacy, pre-1997)
204.94.0.0 - 204.97.255.255
May 9, 2005– Jul 31, 2021
Announced
AS3931 Logical Net Corporation
as part of 204.97.128.0/18
204.97.128.0/18
Aug 16, 2025– today
Announced
AS6079 RCN
Internet provider
Aug 26, 2025
Route object
Rackdog
RADB route object for AS6079 RCN, maintainer MAINT-AS398465
May 27, 2026
Assigned
RCN
Reassigned
204.97.128.0/18
Jul 18, 2026– today
Announced
AS22773 Cox Communications Inc.
as part of 204.97.128.0/18
204.97.128.0/18
today
Leased from
Rackdog
IP broker

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

More specific

Announcements inside

Prefix	Origin	Type	Leased from	Holder	RPKI
204.97.128.0/21 since Oct 4, 2026	AS7029	ISP proxy	IP broker Rackdog	Cogent Communications, LLC
204.97.136.0/21 since Sep 28, 2026	AS7029	ISP proxy	IP broker Rackdog	Cogent Communications, LLC

Registrations in this block

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
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

IPv4 market

Holder

Holder in the market →

Organization: Cogent Communications, LLC
Handle: COGC
Range: 204.94.0.0 - 204.97.255.255
Registration type: Direct Allocation
Record created: Jul 13, 1994
Legacy: yes

Origin network

AS6079

US

Name: RCN
Type: Internet provider
Registered: Apr 4, 2001
Domain: astound.com
Website: www.astound.com
Industry: Internet Service Provider (ISP)
Spamhaus ASN-DROP: not listed