154.21.0.0/16

Currently announced by AS174 Cogent Communications, Inc., in the routed prefix 154.21.0.0/16.

Current ASN: AS174; Cogent Communications, Inc.
Routed prefix: 154.21.0.0/16; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 154.21.0.0/16

Routing data · Nov 1, 2026, 20:20 UTC

ASN historyEvery routed prefix covering 154.21.0.0/16

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
154.21.0.0/16	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing

More specific routes97 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
154.21.8.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.10.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.13.0/24	AS400211	Port 80	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.14.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.15.0/24	AS272935	GB TELECORP DOMINICANA, S.R.L	Dominican Republic	Before monitoring	2026-11-01 20:20	Announcing
154.21.16.0/22	AS5650	Frontier Communications of America (FCA)	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.20.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.22.0/23	AS149487	MOC COMPANY LIMITED	Myanmar (Burma)	Before monitoring	2026-11-01 20:20	Announcing
154.21.22.0/24	AS149487	MOC COMPANY LIMITED	Myanmar (Burma)	Before monitoring	2026-11-01 20:20	Announcing
154.21.24.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.26.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.31.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.36.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.38.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.40.0/24	AS150044	MIEUXTECH-AS-IN	India	Before monitoring	2026-11-01 20:20	Announcing
154.21.41.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.56.0/24	AS55066	eStruxture AS55066	Canada	Before monitoring	2026-11-01 20:20	Announcing
154.21.57.0/24	AS55066	eStruxture AS55066	Canada	Before monitoring	2026-11-01 20:20	Announcing
154.21.60.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.62.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.64.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.66.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.68.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.69.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.70.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.80.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.81.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.82.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.83.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.84.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.85.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.86.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.87.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.88.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.89.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.90.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.91.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.92.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.93.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.94.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.95.0/24	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.96.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.98.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.105.0/24	AS138890	Acehlink Media	Indonesia	Before monitoring	2026-11-01 20:20	Announcing
154.21.106.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.107.0/24	AS399275	Solid Systems LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.110.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.112.0/24	AS152491	RACKMONK DATACENTERS PRIVATE LIMITED	India	Before monitoring	2026-11-01 20:20	Announcing
154.21.113.0/24	AS152491	RACKMONK DATACENTERS PRIVATE LIMITED	India	Before monitoring	2026-11-01 20:20	Announcing
154.21.118.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.124.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.126.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.128.0/22	AS396026	Deasil Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.132.0/22	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.136.0/22	AS396026	Deasil Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.148.0/22	AS396026	Deasil Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.154.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.157.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.158.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.160.0/22	AS133527	HuaBo Technology International Limited	Hong Kong SAR China	Before monitoring	2026-11-01 20:20	Announcing
154.21.168.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.172.0/22	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.192.0/21	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.194.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.195.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.196.0/22	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.200.0/22	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.200.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.200.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.201.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.201.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.202.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.202.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.203.0/24	AS979	NETLAB-SDN	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.203.0/24	AS1014	Japan Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.204.0/22	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.205.0/24	AS197196	PANSTAR-AS	Hong Kong SAR China	2026-10-27 14:20	2026-11-01 20:20	Announcing
154.21.208.0/23	AS397797	City of Marshall	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.210.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.212.0/23	AS46475	Limestone Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.214.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.215.0/24	AS56504	HostCircle AS56504	Netherlands	Before monitoring	2026-11-01 20:20	Announcing
154.21.216.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.217.0/24	AS138890	Acehlink Media	Indonesia	Before monitoring	2026-11-01 20:20	Announcing
154.21.218.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.224.0/21	AS396026	Deasil Networks	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.232.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.234.0/23	AS154871	Comprint Tech-Solutions (I) PRIVATE LIMITED	India	Before monitoring	2026-11-01 20:20	Announcing
154.21.236.0/23	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.238.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.239.0/24	AS399275	Solid Systems LLC	United States	Before monitoring	2026-11-01 20:20	Announcing
154.21.32.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-10-28 16:21	Stopped
154.21.33.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-10-28 16:21	Stopped
154.21.34.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-10-28 16:21	Stopped
154.21.35.0/24	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-10-28 16:21	Stopped
154.21.80.0/20	AS906	DMIT Cloud Infrastructure	United States	Before monitoring	2026-11-01 04:25	Stopped
154.21.205.0/24	AS979	NETLAB-SDN	United States	2026-10-24 10:20	2026-10-28 12:21	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: 154.21.0.0/16
Country: United States
Allocation date: 1992-02-05
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.