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Data as of Nov 3, 2026

72.244.136.0/23

Anonymizer · ISP proxy

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

Announcement
this exact prefix
RPKI valid
Announced by
AS3257
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Aug 2026
its first announcement on record
IPv4 market

Path

Announced by AS3257 since Aug 2026 · 10 wk ago
1 · Holder
GTT Americas, LLC
record created Mar 22, 2005 · reallocated to Internet Utilities NA LLC Jul 30, 2025
2 · Leased from
IPXO
3 · Announced by
AS3257 GTT Communications Inc.
since Aug 2026 · 10 wk ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 72.244.136.0/23/24s
IPXO
512100%
2

Lineage

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

72.244.136.0/23

From the registry to its use

  1. Mar 22, 2005
    Registry record
    GTT Americas, LLC
    Direct Allocation
    72.244.0.0/15
  2. Sep 22, 2005– May 15, 2022
    Announced
    AS18566 GTT Americas, LLC
    as part of 72.244.0.0/15
    72.244.0.0/15
  3. Apr 29, 2023– today
    Announced
    AS3257 GTT Communications Inc.
    as part of 72.244.0.0/15
    72.244.0.0/15
  4. Jul 30, 2025
    Reallocated
    Internet Utilities NA LLC
    Reallocated
    72.244.0.0/16
  5. Dec 17, 2025
    Route object
    AS834 IPXO LLC
    ARIN route object for AS834 IPXO LLC, maintainer MNT-GAL-104
    72.244.137.0/24
  6. Dec 21, 2025
    Route object
    AS834 IPXO LLC
    ARIN route object for AS834 IPXO LLC, maintainer MNT-GAL-104
    72.244.136.0/24
  7. Jul 31, 2026
    Route object
    AS3257 GTT Communications Inc.
    ARIN route object for AS3257 GTT Communications Inc., maintainer MNT-GAL-104
  8. Aug 23, 2026– today
    Announced
    AS3257 GTT Communications Inc.
    Internet provider
  9. today
    Leased from
    IPXO
    IP broker

Announcements

Less specific

Covering announcements

PrefixOriginTypeLeased fromProxy exitsHolderRPKI
72.244.0.0/15
since Apr 2023
AS3257Internet providerIP broker IPXO (part)433
76 always on
GTT Americas, 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
72.244.0.0/15131,072MEGAPATH-BLK-63GTT Americas, LLC (GAL-104) · USDirect AllocationMar 22, 2005[email protected]
└ 72.244.0.0/1665,536IPXO-GTTIPXO LLC (IL-845) · USReallocatedJul 18, 2025[email protected]
└ 72.244.0.0/1665,536NETUTILSInternet Utilities NA LLC (DCL-577) · USReallocatedJul 30, 2025[email protected]
└ 72.244.136.0/24256NET-72-244-136-0-24IPNetZone (IPNET-1) · USReallocatedMar 25, 2026[email protected]
└ 72.244.136.0/24256RCN-GTTRCN (RTSL-6) · USReallocatedSep 25, 2026[email protected]
└ 72.244.137.0/24256NET-72-244-137-0-24IPNetZone (IPNET-1) · USReallocatedMar 25, 2026[email protected]
└ 72.244.137.0/24256RCN-GTTRCN (RTSL-6) · USReallocatedSep 25, 2026[email protected]

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
IPv4 market

Holder

Holder in the market →
Organization
GTT Americas, LLC
Handle
GAL-104
Range
72.244.0.0/15
Registration type
Direct Allocation
Record created
Mar 22, 2005
Reallocated to
Internet Utilities NA LLC (DCL-577)
Reallocated range
72.244.0.0/16
Reallocated
Jul 30, 2025
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