72.156.0.0/14

Currently announced by AS6389 AT&T Enterprises, LLC, in the routed prefix 72.156.0.0/14.

Current ASN: AS6389; AT&T Enterprises, LLC
Routed prefix: 72.156.0.0/14; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 72.156.0.0/14

Routing data · Oct 23, 2026, 20:21 UTC

ASN historyEvery routed prefix covering 72.156.0.0/14

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
72.156.0.0/14	AS6389	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-23 20:21	Announcing

More specific routes18 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
72.157.0.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.4.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.8.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.10.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.12.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.16.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.18.0/24	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.20.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.24.0/23	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.240.0/21	AS11712	AT&T Services, Inc.	United States	Before monitoring	2026-10-23 20:21	Announcing
72.157.248.0/21	AS11712	AT&T Services, Inc.	United States	Before monitoring	2026-10-23 20:21	Announcing
72.158.126.0/24	AS40844	Winn-Dixie Stores, Inc.	United States	Before monitoring	2026-10-23 20:21	Announcing
72.158.127.0/24	AS40844	Winn-Dixie Stores, Inc.	United States	Before monitoring	2026-10-23 20:21	Announcing
72.158.134.0/24	AS25641	—	—	Before monitoring	2026-10-23 20:21	Announcing
72.158.184.0/24	AS19957	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-23 20:21	Announcing
72.159.76.0/24	AS19957	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-23 20:21	Announcing
72.159.149.0/24	AS2939	State of South Carolina	United States	Before monitoring	2026-10-23 20:21	Announcing
72.159.38.0/23	AS2386	AT&T Data Communications Services	United States	Before monitoring	2026-10-23 12:18	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: 72.156.0.0/14
Country: United States
Allocation date: 2005-08-11
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.