66.253.0.0/17

Currently announced by AS3257 GTT Communications (AS3257), in the routed prefix 66.253.0.0/17.

Current ASN: AS3257; GTT Communications (AS3257)
Routed prefix: 66.253.0.0/17; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 66.253.0.0/17

Routing data · Nov 1, 2026, 20:20 UTC

ASN historyEvery routed prefix covering 66.253.0.0/17

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
66.253.0.0/17	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing

More specific routes100 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
66.253.0.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.1.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.2.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.3.0/24	AS39600	BUNNY-TECHNOLOGY-LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.4.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.5.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.6.0/24	AS151373	JAPAN 3D PRINTER	Japan	Before monitoring	2026-11-01 20:20	Announcing
66.253.7.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.8.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.9.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.10.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.11.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.13.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.14.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.15.0/24	AS151373	JAPAN 3D PRINTER	Japan	Before monitoring	2026-11-01 20:20	Announcing
66.253.16.0/24	AS151373	JAPAN 3D PRINTER	Japan	Before monitoring	2026-11-01 20:20	Announcing
66.253.17.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.18.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.19.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.20.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.21.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.22.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.23.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.24.0/24	AS11696	Fusion Connect	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.25.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.26.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.27.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.28.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.29.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.30.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.31.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.32.0/24	AS151373	JAPAN 3D PRINTER	Japan	Before monitoring	2026-11-01 20:20	Announcing
66.253.33.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.34.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.35.0/24	AS151373	JAPAN 3D PRINTER	Japan	Before monitoring	2026-11-01 20:20	Announcing
66.253.36.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.38.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.39.0/24	AS3257	GTT Communications (AS3257)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.40.0/24	AS39600	BUNNY-TECHNOLOGY-LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.41.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.42.0/24	AS48529	quantumbeam	United Kingdom	Before monitoring	2026-11-01 20:20	Announcing
66.253.43.0/24	AS48529	quantumbeam	United Kingdom	Before monitoring	2026-11-01 20:20	Announcing
66.253.44.0/24	AS38854	—	—	Before monitoring	2026-11-01 20:20	Announcing
66.253.45.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.46.0/24	AS48529	quantumbeam	United Kingdom	Before monitoring	2026-11-01 20:20	Announcing
66.253.47.0/24	AS62610	Zenlayer Elastic Compute	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.48.0/22	AS36916	X-Dsl Networking Solutions	South Africa	Before monitoring	2026-11-01 20:20	Announcing
66.253.52.0/22	AS11611	Arctic Fox Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.56.0/22	AS7459	Grande Communications	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.60.0/22	AS36916	X-Dsl Networking Solutions	South Africa	Before monitoring	2026-11-01 20:20	Announcing
66.253.64.0/22	AS5650	Frontier Communications of America (FCA)	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.68.0/24	AS39521	TNGNET B.V.	Netherlands	2026-10-30 22:21	2026-11-01 20:20	Announcing
66.253.68.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.69.0/24	AS39521	TNGNET B.V.	Netherlands	2026-10-30 22:21	2026-11-01 20:20	Announcing
66.253.69.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.70.0/24	AS401322	NetO Corp	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.71.0/24	AS274983	INGENIERIA E INFRAESTRUCTURA DE COLOMBIA S.A.S.	Colombia	Before monitoring	2026-11-01 20:20	Announcing
66.253.72.0/24	AS7922	Comcast	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.73.0/24	AS26042	FIBERSTATE	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.74.0/24	AS270187	2M SOLUCIONES	Mexico	Before monitoring	2026-11-01 20:20	Announcing
66.253.75.0/24	AS270187	2M SOLUCIONES	Mexico	Before monitoring	2026-11-01 20:20	Announcing
66.253.76.0/24	AS7922	Comcast	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.77.0/24	AS7922	Comcast	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.78.0/24	AS7922	Comcast	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.79.0/24	AS39521	TNGNET B.V.	Netherlands	2026-10-30 22:21	2026-11-01 20:20	Announcing
66.253.79.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.80.0/22	AS393427	Wired Tech LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.84.0/24	AS401322	NetO Corp	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.85.0/24	AS26042	FIBERSTATE	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.86.0/24	AS401322	NetO Corp	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.87.0/24	AS39521	TNGNET B.V.	Netherlands	2026-10-30 22:21	2026-11-01 20:20	Announcing
66.253.87.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.88.0/22	AS393427	Wired Tech LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.92.0/24	AS401839	Pyro Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.93.0/24	AS212238	CDNEXT	United Kingdom	Before monitoring	2026-11-01 20:20	Announcing
66.253.94.0/24	AS36139	Intrigue Communications LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.95.0/24	AS402072	OZONTI NETWORK LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.96.0/24	AS152606	LINK4 COMMUNICATION	Bangladesh	2026-10-24 22:19	2026-11-01 20:20	Announcing
66.253.98.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.99.0/24	AS2914	NTT Global IP Network	United States	2026-10-27 22:19	2026-11-01 20:20	Announcing
66.253.99.0/24	AS7029	Uniti Kinetic	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.100.0/24	AS397423	Tier.Net Technologies LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.103.0/24	AS7029	Uniti Kinetic	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.104.0/24	AS8796	Fast Data	United States	2026-10-29 02:22	2026-11-01 20:20	Announcing
66.253.105.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.106.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.107.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.110.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.112.0/24	AS274564	Halver LTDA	Brazil	Before monitoring	2026-11-01 20:20	Announcing
66.253.113.0/24	AS152672	Aiyun (HK) Network Technology Limited	China	Before monitoring	2026-11-01 20:20	Announcing
66.253.114.0/24	AS39521	TNGNET B.V.	Netherlands	2026-10-30 22:21	2026-11-01 20:20	Announcing
66.253.114.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.115.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.116.0/22	AS400175	Microtronix ESolutions, LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.120.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.121.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.122.0/24	AS6079	Astound	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.123.0/24	AS53340	Fiberhub	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.124.0/22	AS13737	Interconnecx, LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
66.253.12.0/24	AS5065	Bunny Communications	United States	Before monitoring	2026-10-19 20:18	Stopped

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

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RIR allocation record

Registry: ARIN
Allocated block: 66.253.0.0/17
Country: United States
Allocation date: 2005-11-21
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.