154.56.112.0/24

Currently announced jointly by AS174 Cogent Communications, Inc., AS21859 Zenlayer Edge Cloud Network - AS21859, in the routed prefix 154.56.112.0/24.

Current ASN: AS174 AS21859; Cogent Communications, Inc.
Routed prefix: 154.56.112.0/24; Most specific route covering this prefix
ASNs over time: 2; 3 announcement records
RIR allocation: ARIN; United States · 154.56.0.0/16

Routing data · Nov 1, 2026, 20:20 UTC

ASN historyEvery routed prefix covering 154.56.112.0/24

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
154.56.112.0/24	AS174	Cogent Communications, Inc.	United States	2026-10-30 18:22	2026-11-01 20:20	Announcing
154.56.112.0/24	AS21859	Zenlayer Edge Cloud Network - AS21859	United States	Before monitoring	2026-11-01 20:20	Announcing
154.48.0.0/12	AS174	Cogent Communications, Inc.	United States	Before monitoring	2026-11-01 20:20	Announcing

More specific routes0 total

No more specific routes inside this prefix.

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-10-30 18:22	154.56.112.0/24	Origin added	AS174	Cogent Communications, Inc.	AS21859	United States

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RIR allocation record

Registry: ARIN
Allocated block: 154.56.0.0/16
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.