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Data as of Nov 8, 2026

204.120.0.0/16

16,384 anonymizer addresses · 25% · ISP proxy

Cogent Communications, LLC

Announcement
this exact prefix
No RPKI
Announced by
AS174
Type
Internet provider
74% of it
IPv4 market

Path

1 · Holder
Cogent Communications, LLC
record created Aug 12, 1994
2 · Leased from
Rackdog
for its owner Cogent Communications, LLC
3 · Announced by
AS174 Cogent Communications, LLC
since May 2024 · 2.5 yr ago
4 · Use
Internet provider
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 204.120.0.0/16/24s
Rackdog
16,38425%
64
Leased from

Owners leasing their own space

NameIn 204.120.0.0/16/24s
Cogent Communications, LLC
16,38425%
64

Lineage

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

204.120.0.0/16

From the registry to its use

  1. Aug 12, 1994
    Registry record
    Cogent Communications, LLC
    Direct Allocation (legacy, pre-1997)
    204.117.0.0 - 204.120.255.255
  2. Sep 8, 1999
    Route object
    AS13795 Smart Way Communications, LLC
    RADB route object for AS13795 Smart Way Communications, LLC, maintainer MAINT-AS1828
    204.120.207.0/24
  3. Dec 16, 2003
    Route object
    AS6517 LAKENETWORKS
    RADB route object for AS6517 LAKENETWORKS, maintainer MAINT-AS3257
    204.120.245.0/24
  4. May 9, 2005– May 16, 2024
    Announced
    AS1239 Cogent Communications, LLC
  5. May 21, 2007
    Route object
    AS33739 Myspace LLC
    ALTDB route object for AS33739 Myspace LLC, maintainer MAINT-MYSPACE
    204.120.182.0/24
  6. Jan 2, 2018
    Route object
    AS11359 Zayo Bandwidth
    RADB route object for AS11359 Zayo Bandwidth, maintainer MAINT-SWITCH
    204.120.132.0/22
  7. May 11, 2021
    Route object
    AS1239 Cogent Communications, LLC
    ARIN route object for AS1239 Cogent Communications, LLC, maintainer MNT-COGC
  8. Jun 6, 2023
    Route object
    AS174 Cogent Communications, LLC
    ARIN route object for AS174 Cogent Communications, LLC, maintainer MNT-COGC
  9. May 5, 2024– today
    Announced
    AS174 Cogent Communications, LLC
    Internet provider
  10. Nov 4, 2026
    Route object
    AS22773 Cox Communications Inc.
    RADB route object for AS22773 Cox Communications Inc., maintainer MAINT-AS22773
    204.120.64.0/18

Announcements

More specific

Announcements inside

PrefixOriginTypeLeased fromHolderRPKI
204.120.64.0/20
since Sep 2025
AS7459ISP proxyIP broker RackdogCogent Communications, LLC
204.120.80.0/20
since Sep 2025
AS7459ISP proxyIP broker RackdogCogent Communications, LLC
204.120.96.0/20
since Sep 2025
AS7459ISP proxyIP broker RackdogCogent Communications, LLC
204.120.112.0/20
since Sep 2025
AS7459ISP proxyIP broker RackdogCogent Communications, LLC
204.120.131.0/24
since Jan 2019
AS4972BusinessCogent Communications, LLC
204.120.173.0/24
since Feb 2024
AS174UnknownCogent Communications, LLC
204.120.180.0/24
since Jun 2020
AS40724BusinessCogent 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
204.117.0.0 - 204.120.255.255262,144COGCCogent Communications, LLC (COGC) · USDirect AllocationAug 12, 1994abuse@cogentco.com
└ 204.120.3.0/2816SPRINTLINKunknown———
└ 204.120.3.16/2816SPRINTLINKunknown———
└ 204.120.3.224/2732FON-343041737698368unknown———
└ 204.120.46.64/2732SPRINTLINKunknown———
└ 204.120.61.0/24256FON-343043200028932unknown———
└ 204.120.64.0/1816,384RACKDOG-CGNT-NET-28RCN (C11605223) · USReassignedMay 27, 2026abuse@cogentco.com
via COGC
└ 204.120.131.0/24256SPRINTLINKUPS (UPS-62) · USReassignedMar 14, 2018network@ups.com
└ 204.120.165.128/298SPRINTLINKunknown———
└ 204.120.171.0/2816SPRINTLINKunknown———
└ 204.120.171.16/2816SPRINTLINKunknown———
└ 204.120.171.32/2816SPRINTLINKunknown———
└ 204.120.171.72/298SPRINTLINKunknown———
└ 204.120.171.80/298SPRINTLINKunknown———
└ 204.120.171.88/298SPRINTLINKunknown———
└ 204.120.171.128/298SPRINTLINKunknown———
└ 204.120.172.0/23512SPRINTLINKThyssenKrupp Materials NA (TMN-3) · USReassignedOct 8, 2003syed.Firoz@thyssenkrupp.com
└ 204.120.180.0/24256SPRINTLINKDekalb County Government (DCG-54) · USReassignedJun 7, 2018—
└ 204.120.182.0/24256SPRINTunknown———
└ 204.120.205.112/298SPRINTLINKunknown———

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

Composition

The types across the prefix's announced space, by addresses.

Announced space

Address share

Announced space

Types across the prefix

65,536 addresses
TypeAddressesShareRanges
Internet provider48,22474%12
ISP proxyanonymizer16,38425%4
Business6721.0%14
Unknown2560.39%1

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Origin network

AS174

US
Name
Cogent Communications, LLC
Type
Internet provider
Registered
May 16, 1996
Domain
cogentco.com
Website
www.cogentco.com/
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed
VPN servers
1,658