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Data as of Nov 3, 2026

66.253.78.0/24

Anonymizer · ISP proxy

Comcast Cable Communications, LLC · space held by GTT Americas, LLC

Announcement
this exact prefix
RPKI valid
Announced by
AS7922
Type
ISP proxy
Risk
90 / 100 · Critical
IPv4 market

Path

1 · Holder
GTT Americas, LLC
record created Nov 21, 2005 · reallocated to Internet Utilities NA LLC Jul 22, 2025
2 · Leased from
IPXO
for its owner GTT Americas, LLC
3 · Announced by
AS7922 Comcast Cable Communications, LLC
since Oct 2025 · 13 mo ago
4 · Use
ISP proxy
anonymizer space, operator not named

Operators, sellers and brokers

Leased from

IP brokers

NameIn 66.253.78.0/24/24s
IPXO
256100%
1
Leased from

Owners leasing their own space

NameIn 66.253.78.0/24/24s
GTT Americas, LLC
256100%
1

Lineage

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

66.253.78.0/24

From the registry to its use

  1. Nov 21, 2005
    Registry record
    GTT Americas, LLC
    Direct Allocation
    66.253.0.0/17
  2. Jul 8, 2006– Jun 8, 2016
    Announced
    AS23504 GTT Americas, LLC
    as part of 66.253.0.0/17
    66.253.0.0/17
  3. Jun 15, 2016– May 15, 2022
    Announced
    AS18566 GTT Americas, LLC
    as part of 66.253.0.0/17
    66.253.0.0/17
  4. Apr 29, 2023– Nov 2, 2026
    Announced
    AS3257 GTT Communications Inc.
    as part of 66.253.0.0/17
    66.253.0.0/17
  5. Jul 22, 2025
    Reallocated
    Internet Utilities NA LLC
    Reallocated
    66.253.64.0/18
  6. Oct 6, 2025
    Assigned
    Internet Utilities NA LLC
    Reassigned
    66.253.78.0/24
  7. Oct 6, 2025
    Route object
    IPXO
    ARIN route object for AS7922 Comcast Cable Communications, LLC, maintainer MNT-DCL-577
  8. Oct 7, 2025
    Route object
    IPXO
    RADB route object for AS7922 Comcast Cable Communications, LLC, maintainer MAINT-AS834
  9. Oct 15, 2025– Nov 2, 2026
    Announced
    AS7922 Comcast Cable Communications, LLC
    Internet provider
  10. today
    Leased from
    IPXO
    IP broker

Announcements

Less specific

Covering announcements

PrefixOriginTypeAnonymizer addressesOperatorLeased fromProxy exitsHolderRPKI
66.253.0.0/17
since Apr 2023
AS3257Internet provider5121.6%ISP proxyProxy providersoperated by Bunnysold by NovadaIP broker IPXO (part)313
26 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
66.253.0.0/1732,768MEGAPATH-BLK-56GTT Americas, LLC (GAL-104) · USDirect AllocationNov 21, 2005[email protected]
└ 66.253.64.0/1816,384IPXO-GTTIPXO LLC (IL-845) · USReallocatedJul 18, 2025[email protected]
└ 66.253.64.0/1816,384NETUTILSInternet Utilities NA LLC (DCL-577) · USReallocatedJul 22, 2025[email protected]
└ 66.253.78.0/24256MOD MISSION CRITICALunknownReassignedOct 6, 2025[email protected]
via IPXO-GTT

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
GTT Americas, LLC
Handle
GAL-104
Range
66.253.0.0/17
Registration type
Direct Allocation
Record created
Nov 21, 2005
Reallocated to
Internet Utilities NA LLC (DCL-577)
Reallocated range
66.253.64.0/18
Reallocated
Jul 22, 2025
Origin network

AS7922

US
Name
Comcast Cable Communications, LLC
Type
Internet provider
Registered
Feb 14, 1997
Domain
comcast.com
Website
corporate.comcast.com/
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed