209.36.0.0/15

Currently announced by AS7018 AT&T US - 7018, in the routed prefix 209.36.0.0/15.

Current ASN: AS7018; AT&T US - 7018
Routed prefix: 209.36.0.0/15; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 209.36.0.0/15

Routing data · Nov 2, 2026, 00:27 UTC

ASN historyEvery routed prefix covering 209.36.0.0/15

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
209.36.0.0/15	AS7018	AT&T US - 7018	United States	Before monitoring	2026-11-02 00:27	Announcing

More specific routes16 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
209.36.135.0/24	AS399198	Oklahoma City Convention Center	United States	Before monitoring	2026-11-02 00:27	Announcing
209.36.216.0/24	AS2386	AT&T Data Communications Services	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.4.0/24	AS18662	Aflac	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.59.0/24	AS398943	Liberator Medical Supply, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.60.0/24	AS398943	Liberator Medical Supply, Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.101.0/24	AS26657	Neuropace	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.104.0/24	AS4473	AT&T Enterprises, LLC	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.105.0/24	AS4473	AT&T Enterprises, LLC	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.106.0/24	AS4473	AT&T Enterprises, LLC	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.107.0/24	AS4473	AT&T Enterprises, LLC	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.109.0/24	AS4473	AT&T Enterprises, LLC	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.110.0/24	AS4473	AT&T Enterprises, LLC	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.171.0/24	AS25725	E INK CORPORATION	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.217.0/24	AS4917	AMDOCS Inc.	United States	Before monitoring	2026-11-02 00:27	Announcing
209.37.109.0/24	AS4186	AT&T Enterprises, LLC	United States	2026-10-28 06:19	2026-10-30 04:19	Stopped
209.37.110.0/24	AS4186	AT&T Enterprises, LLC	United States	2026-10-28 06:19	2026-10-30 04:19	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: 209.36.0.0/15
Country: United States
Allocation date: 1997-02-12
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.