150.251.16.0/20

Currently announced by AS3257 GTT Communications (AS3257), in the routed prefix 150.251.16.0/20.

Current ASN: AS3257; GTT Communications (AS3257)
Routed prefix: 150.251.16.0/20; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: RIPENCC; United States · 150.251.16.0/20

Routing data · Nov 1, 2026, 18:24 UTC

ASN historyEvery routed prefix covering 150.251.16.0/20

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
150.251.16.0/20	AS3257	GTT Communications (AS3257)	United States	2026-10-31 02:18	2026-11-01 18:24	Announcing

More specific routes16 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
150.251.16.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 20:18	Stopped
150.251.17.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 16:19	Stopped
150.251.18.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 16:19	Stopped
150.251.19.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 12:19	Stopped
150.251.20.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 12:19	Stopped
150.251.21.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 12:19	Stopped
150.251.22.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 12:19	Stopped
150.251.23.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 16:19	Stopped
150.251.24.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 20:18	Stopped
150.251.25.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 12:19	Stopped
150.251.26.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 16:19	Stopped
150.251.27.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 12:19	Stopped
150.251.28.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 20:18	Stopped
150.251.29.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 20:18	Stopped
150.251.30.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 20:18	Stopped
150.251.31.0/24	AS398781	OCULUS NETWORKS INC	United States	Before monitoring	2026-10-25 20:18	Stopped

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-10-31 02:18	150.251.16.0/20	New announcement	AS3257	GTT Communications (AS3257)	—	United States

Look up another address

RIR allocation record

Registry: RIPENCC
Allocated block: 150.251.16.0/20
Country: United States
Allocation date: 1991-08-19
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.