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Data as of Nov 9, 2026

204.242.178.0/23

Anonymizer · ISP proxy

Level 3 Parent, LLC · space held by Cogent Communications, LLC

Announcement
this exact prefix
No RPKI
Announced by
AS10753
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Jul 2026
its first announcement on record
IPv4 market

Path

Announced by AS10753 since Jul 2026 · 4 mo ago
1 · Holder
Cogent Communications, LLC
record created Dec 20, 1994
2 · Leased from
Rackdog
for its owner Cogent Communications, LLC
3 · Announced by
AS10753 Level 3 Parent, LLC
since Jul 2026 · 4 mo ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 204.242.178.0/23/24s
Rackdog
512100%
2
Leased from

Owners leasing their own space

NameIn 204.242.178.0/23/24s
Cogent Communications, LLC
512100%
2

Lineage

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

204.242.178.0/23

From the registry to its use

  1. Dec 20, 1994
    Registry record
    Cogent Communications, LLC
    Direct Allocation (legacy, pre-1997)
    204.240.0.0/14
  2. Mar 17, 2022– today
    Announced
    AS6079 RCN
    as part of 204.242.176.0/20
    204.242.176.0/20
  3. May 27, 2026
    Assigned
    RCN
    Reassigned
    204.242.0.0/16
  4. Jul 6, 2026
    Route object
    Rackdog
    RADB route object for AS10753 Level 3 Parent, LLC, maintainer MAINT-AS398465
  5. Jul 6, 2026– today
    Announced
    AS10753 Level 3 Parent, LLC
    Internet provider
  6. today
    Leased from
    Rackdog
    IP broker

Announcements

Less specific

Covering announcements

PrefixOriginTypeAnonymizer addressesLeased fromHolderRPKI
204.242.176.0/20
since Mar 2022
AS6079ISP proxy3,07275%IP broker RackdogCogent Communications, LLC
204.240.0.0/14
since May 2005
AS174Internet providerCogent 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.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
204.240.0.0/14262,144COGENT-204-240-14Cogent Communications, LLC (COGC) · USDirect AllocationDec 20, 1994abuse@cogentco.com
└ 204.242.0.0/1665,536RACKDOG-CGNT-NET-33RCN (C11605228) · USReassignedMay 27, 2026abuse@cogentco.com
via COGENT-204-240-14

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

AnnouncementRouting historyRPKI & IRRWhois & abuse
IPv4 market

Holder

Holder in the market →
Organization
Cogent Communications, LLC
Handle
COGC
Range
204.240.0.0/14
Registration type
Direct Allocation
Record created
Dec 20, 1994
Legacy
yes
Origin network

AS10753

US
Name
Level 3 Parent, LLC
Type
Internet provider
Registered
Nov 18, 1997
Domain
level3.com
Industry
Hosting and Cloud Provider
Spamhaus ASN-DROP
not listed