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Data as of Nov 7, 2026

204.217.210.0/24

Anonymizer · Datacenter proxy

Leaseweb Japan K.K. · space held by Cogent Communications, LLC

Announcement
this exact prefix
RPKI valid
Announced by
AS134351
Type
Datacenter proxy
Risk
85 / 100 · Critical
IPv4 market

Path

1 · Holder
Cogent Communications, LLC
record created Dec 29, 1994 · reallocated to Aventice LLC Nov 26, 2021
2 · Leased from
Aventice
for its owner Cogent Communications, LLC
3 · Announced by
AS134351 Leaseweb Japan K.K.
since Aug 2022 · 4.2 yr ago
4 · Use
Datacenter proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 204.217.210.0/24/24s
Aventice
256100%
1
Leased from

Owners leasing their own space

NameIn 204.217.210.0/24/24s
Cogent Communications, LLC
256100%
1

Lineage

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

204.217.210.0/24

From the registry to its use

  1. Dec 29, 1994
    Registry record
    Cogent Communications, LLC
    Direct Allocation (legacy, pre-1997)
    204.217.0.0/16
  2. May 9, 2005– today
    Announced
    AS174 Cogent Communications, LLC
    as part of 204.217.0.0/16
    204.217.0.0/16
  3. Nov 26, 2021
    Reallocated
    Aventice LLC
    Reallocated
    204.217.128.0/17
  4. Dec 11, 2021– Jan 27, 2022
    Announced
    AS46261 QuickPacket, LLC
    Hosting
  5. Aug 8, 2022– today
    Announced
    AS134351 Leaseweb Japan K.K.
    Hosting
  6. Aug 10, 2022
    Route object
    AS134351 Leaseweb Japan K.K.
    RADB route object for AS134351 Leaseweb Japan K.K., maintainer MAINT-AS16265
  7. Aug 15, 2026
    Route object
    AS134351 Leaseweb Japan K.K.
    ARIN route object for AS134351 Leaseweb Japan K.K., maintainer MNT-AL-584
  8. today
    Leased from
    Aventice
    IP broker

Announcements

Less specific

Covering announcements

PrefixOriginTypeAnonymizer addressesLeased fromHolderRPKI
204.217.0.0/16
since May 2005
AS174Internet provider5,3768.2%ISP proxyIP broker Aventice (part)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.

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
IPv4 market

Holder

Holder in the market →
Organization
Cogent Communications, LLC
Handle
COGC
Range
204.217.0.0/16
Registration type
Direct Allocation
Record created
Dec 29, 1994
Legacy
yes
Reallocated to
Aventice LLC (AL-584)
Reallocated range
204.217.128.0/17
Reallocated
Nov 26, 2021
Origin network

AS134351

JP
Name
Leaseweb Japan K.K.
Type
Hosting
Registered
Mar 13, 2020
Domain
leaseweb.com
Website
www.leaseweb.com/
Industry
Hosting and Cloud Provider
Spamhaus ASN-DROP
not listed