65.172.0.0/15

Currently announced by AS174 Cogent Communications, Inc., in the routed prefix 65.172.0.0/15.

Current ASN: AS174; Cogent Communications, Inc.
Routed prefix: 65.172.0.0/15; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 65.172.0.0/15

Routing data · Nov 2, 2026, 08:23 UTC

ASN historyEvery routed prefix covering 65.172.0.0/15

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
65.172.0.0/15	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing

More specific routes37 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
65.172.24.0/22	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.24.0/23	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.24.0/24	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.25.0/24	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.26.0/23	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.26.0/24	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.27.0/24	AS14813	BB-COLUMBUS	Barbados	Before monitoring	2026-11-02 08:23	Announcing
65.172.54.0/24	AS1647	Interop Technologies	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.71.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.72.0/23	AS18632	Volcano Vision, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.132.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.240.0/24	AS15065	Slic Network Solutions, Inc	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.241.0/24	AS15065	Slic Network Solutions, Inc	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.242.0/24	AS15065	Slic Network Solutions, Inc	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.243.0/24	AS15065	Slic Network Solutions, Inc	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.244.0/22	AS18435	The Junction Internet, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.244.0/24	AS18435	The Junction Internet, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.245.0/24	AS18435	The Junction Internet, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.246.0/24	AS18435	The Junction Internet, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.172.247.0/24	AS18435	The Junction Internet, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.64.0/22	AS11398	CenturyLink Communications, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.76.0/24	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.78.0/24	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.79.0/24	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.82.0/23	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.82.0/24	AS19901	Brightspeed	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.84.0/23	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.86.0/23	AS11398	CenturyLink Communications, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.86.0/24	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.88.0/23	AS11398	CenturyLink Communications, LLC	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.90.0/24	AS209	Lumen AS209	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.92.0/22	AS19901	Brightspeed	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.93.0/24	AS19901	Brightspeed	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.94.0/24	AS19901	Brightspeed	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.160.0/19	AS4637	Telstra (International)	Hong Kong SAR China	Before monitoring	2026-11-02 08:23	Announcing
65.173.245.0/24	AS21582	Northern Arizona University	United States	Before monitoring	2026-11-02 08:23	Announcing
65.173.91.0/24	AS19901	Brightspeed	United States	Before monitoring	2026-10-28 04:18	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: 65.172.0.0/15
Country: United States
Allocation date: 2000-09-19
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.