204.240.0.0/14

Currently announced by AS174 Cogent Communications, Inc., in the routed prefix 204.240.0.0/14.

Current ASN: AS174; Cogent Communications, Inc.
Routed prefix: 204.240.0.0/14; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 204.240.0.0/14

Routing data · Nov 8, 2026, 10:26 UTC

ASN historyEvery routed prefix covering 204.240.0.0/14

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
204.240.0.0/14	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-08 10:26	Announcing

More specific routes37 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
204.241.18.0/24	AS27514	Kingdon Capital Management, LLC	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.0.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.1.0/24	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.7.0/24	AS398465	Rackdog	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.16.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.32.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.32.0/21	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.40.0/21	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.48.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.64.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.80.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.80.0/21	AS7029	Uniti Kinetic	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.88.0/21	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.96.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.112.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.112.0/21	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.120.0/21	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.128.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.144.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.160.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.168.0/21	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.176.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.178.0/23	AS10753	Level 3 Parent, LLC	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.180.0/23	AS10753	Level 3 Parent, LLC	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.192.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.192.0/21	AS3320	Deutsche Telekom	Germany	Before monitoring	2026-11-08 10:26	Announcing
204.242.208.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.224.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.224.0/21	AS11404	Wave Division Holdings	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.240.0/20	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.241.0/24	AS6079	Astound	United States	Before monitoring	2026-11-08 10:26	Announcing
204.242.144.0/21	AS6079	Astound	United States	Before monitoring	2026-11-03 00:25	Stopped
204.242.152.0/21	AS6079	Astound	United States	Before monitoring	2026-11-03 00:25	Stopped
204.242.184.0/21	AS6079	Astound	United States	Before monitoring	2026-11-03 00:25	Stopped
204.242.200.0/21	AS6079	Astound	United States	Before monitoring	2026-11-03 00:25	Stopped
204.242.216.0/21	AS6079	Astound	United States	Before monitoring	2026-11-03 00:25	Stopped
204.242.232.0/21	AS6079	Astound	United States	Before monitoring	2026-11-03 00:25	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: 204.240.0.0/14
Country: United States
Allocation date: 1994-12-20
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.