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Data as of Nov 6, 2026

204.217.221.0/24

Anonymizer · ISP proxy

Cogent Communications, LLC

Announcement
204.217.0.0/16
No RPKI
Announced by
AS174
Type
ISP proxy
Risk
90 / 100 · Critical
IPv4 market

Path

1 · Holder
Cogent Communications, LLC
record created Dec 29, 1994
2 · Leased from
Aventice
3 · Announced by
AS174 Cogent Communications, LLC
since May 2005 · 21.5 yr ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 204.217.221.0/24/24s
Aventice
256100%
1

Registrations in this block

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

RangeAddressesNetnameHolderTypeCreatedAbuse contact
204.217.0.0/1665,536COGENT-204-217-16Cogent Communications, LLC (COGC) · USDirect AllocationDec 29, 1994abuse@cogentco.com
└ 204.217.128.0/1732,768NET-204-217-128-0-1Aventice LLC (AL-584) · USReallocatedNov 26, 2021abuse@aventice.com

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Announced by

Covering announcement 204.217.0.0/16

Prefix
204.217.0.0/16
Announced by
AS174 Cogent Communications, LLC
Type
Internet provider
Anonymizer addresses
5,376 addresses · 8.2%ISP proxy
Leased from
IP broker Aventice (part)
RPKI
No RPKI
Netname
COGENT-204-217-16
Registrant
Cogent Communications, LLC
RIR
ARIN
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