151.101.0.0/16

Currently announced by AS54113 Fastly, Inc., in the routed prefix 151.101.0.0/16.

Current ASN: AS54113; Fastly, Inc.
Routed prefix: 151.101.0.0/16; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 151.101.0.0/16

Routing data · Nov 2, 2026, 08:23 UTC

ASN historyEvery routed prefix covering 151.101.0.0/16

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
151.101.0.0/16	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing

More specific routes53 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
151.101.0.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.4.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.8.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.12.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.16.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.20.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.28.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.32.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.40.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.44.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.48.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.52.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.60.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.64.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.68.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.72.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.80.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.84.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.88.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.92.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.104.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.112.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.120.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.128.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.132.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.136.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.140.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.144.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.148.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.152.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.156.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.160.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.164.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.176.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.180.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.184.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.188.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.192.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.196.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.200.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.204.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.208.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.216.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.220.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.224.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.228.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.232.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.236.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.240.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.244.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.248.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.252.0/22	AS54113	Fastly, Inc.	United States	Before monitoring	2026-11-02 08:23	Announcing
151.101.76.0/22	AS54113	Fastly, Inc.	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: 151.101.0.0/16
Country: United States
Allocation date: 2016-02-01
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.