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Data as of Nov 8, 2026

205.247.0.0/20

Anonymizer · ISP proxy

GTT Communications Inc. · space held by Cogent Communications, LLC

Announcement
this exact prefix
No RPKI
Announced by
AS3257
Type
ISP proxy
Risk
90 / 100 · Critical
IPv4 market

Path

1 · Holder
Cogent Communications, LLC
record created Apr 24, 1995 · reallocated to I-2000, Inc. Oct 3, 1995
2 · Leased from
Cogent Communications, LLC
its owner, directly
3 · Announced by
AS3257 GTT Communications Inc.
since Nov 2019 · 7.0 yr ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

Owners leasing their own space

NameIn 205.247.0.0/20/24s
Cogent Communications, LLC
4,096100%
16

Lineage

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

205.247.0.0/20

From the registry to its use

  1. Apr 24, 1995
    Registry record
    Cogent Communications, LLC
    Direct Allocation (legacy, pre-1997)
    205.240.0.0/13
  2. Oct 3, 1995
    Reallocated
    I-2000, Inc.
    Reallocated
    205.247.0.0/20
  3. May 9, 2005– Nov 27, 2019
    Announced
    AS6459 I-2000, Inc.
  4. Sep 14, 2007
    Route object
    AS25821 Priseda LLC
    RADB route object for AS25821 Priseda LLC, maintainer MAINT-AS7029
    205.247.15.0/24
  5. Nov 14, 2019
    Route object
    AS3257 GTT Communications Inc.
    RADB route object for AS3257 GTT Communications Inc., maintainer MAINT-AS3257
  6. Nov 16, 2019– today
    Announced
    AS3257 GTT Communications Inc.
    Internet provider
  7. Sep 18, 2026– today
    Announced
    AS174 Cogent Communications, LLC
    as part of 205.240.0.0/13
    205.240.0.0/13

Announcements

Less specific

Covering announcements

PrefixOriginTypeAnonymizer addressesProxy exitsHolderRPKI
205.240.0.0/13AS174Internet provider77,82415%ISP proxy37
3 always on
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
205.240.0.0/13524,288COGENT-205-240-0Cogent Communications, LLC (COGC) · USDirect AllocationApr 24, 1995abuse@cogentco.com
└ 205.247.0.0/204,096SPRINT-CDF70FI-2000, Inc. (I2I) · USReallocatedOct 3, 1995abuse@gtt.net
└ 205.247.0.64/281610000016762Tabor Academy (C04784709) · USReassignedNov 29, 2013abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.2.0/23512100000Roosevelt Hotel (C04613951) · USReassignedJun 19, 2013abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.4.0/24256LDS-NETLogical Design Solutions (LDS-4) · USReassignedJan 24, 1996tom@mc2usa.com
└ 205.247.5.0 - 205.247.10.2551,536HCRHS-NETHunterdon County Regional High School (C00007786) · USReassignedJan 24, 1996abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.11.8/29810000018261All Market Inc (C06084568) · USReassignedApr 4, 2016abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.12.0/24256ASCENSIONET-NETCustom Computer Design (C00007788) · USReassignedJan 24, 1996abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.13.0/24256I2000-NET6I-2000, Inc. (C00007789) · USReassignedJan 24, 1996abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.14.0/24256REVEO-NETReveo Inc. (C00007790) · USReassignedJan 24, 1996abuse@gtt.net
via SPRINT-CDF70F
└ 205.247.15.216/29810000018367Price Master (C06187936) · USReassignedAug 8, 2016abuse@gtt.net
via SPRINT-CDF70F

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
205.240.0.0/13
Registration type
Direct Allocation
Record created
Apr 24, 1995
Legacy
yes
Reallocated to
I-2000, Inc. (I2I)
Reallocated range
205.247.0.0/20
Reallocated
Oct 3, 1995
Origin network

AS3257

US
Name
GTT Communications Inc.
Type
Internet provider
Registered
Sep 30, 1994
Domain
gtt.net
Website
www.gtt.net
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed
VPN servers
244