2600:300::/24

Currently announced by AS7018 AT&T US - 7018, in the routed prefix 2600:300::/24.

Current ASN: AS7018; AT&T US - 7018
Routed prefix: 2600:300::/24; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: ARIN; United States · 2600:300::/24

Routing data · Oct 24, 2026, 06:23 UTC

ASN historyEvery routed prefix covering 2600:300::/24

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2600:300::/24	AS7018	AT&T US - 7018	United States	Before monitoring	2026-10-24 06:23	Announcing

More specific routes221 total, showing the first 200

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2600:380::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:180::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:800::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:800::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:980::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:c00::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:1000::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:1180::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:1800::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:1800::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:1880::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:2000::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:2580::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:2800::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:3000::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:3180::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:3800::/37	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4400::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4500::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4700::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4800::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4c00::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4c00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4c80::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4d00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:4d80::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5300::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5400::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5800::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5800::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5880::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5900::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5980::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5a00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5a80::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:5c00::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6000::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6080::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6100::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6180::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6200::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6280::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6300::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6380::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6400::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6400::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6480::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6500::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6580::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6600::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6680::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6800::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6900::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6a00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6b00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:6c00::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7400::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7400::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7500::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7600::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7600::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7700::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7700::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7800::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7800::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7900::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7900::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7a00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7b00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7b00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7c00::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7c00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7d00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:7d00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8000::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8400::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8500::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8600::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8700::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8800::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8a00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8b00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8b00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8c00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8d00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:8e00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9000::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9100::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9200::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9400::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9500::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9800::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9900::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9a00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9b00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9c00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9d00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9e00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9f00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:9f00::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a000::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a100::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a100::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a200::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a300::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a300::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a400::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:a500::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b100::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b200::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b300::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b300::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b400::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b500::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b800::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b800::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b880::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b900::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b900::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:b980::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:bc00::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:bd00::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:c000::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:c100::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:c400::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:c500::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f100::/46	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f103::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f104::/46	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f107::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f108::/46	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f10b::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f10c::/46	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f10f::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f180::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f188::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f18c::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f190::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f198::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f19c::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1a0::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1a4::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1a8::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1aa::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1ae::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1af::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1b0::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1b4::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1b9::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1ba::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1bc::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1be::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1c0::/44	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1d0::/44	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1d0::/48	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1d2::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1d4::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1d6::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1d8::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1dc::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1e0::/44	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1e2::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1e4::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1e6::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1e8::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1f0::/44	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1f1::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1f4::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1f6::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1f8::/47	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1fb::/48	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:f1fc::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:380:fe00::/39	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:380:ff80::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381::/38	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381:80::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381:100::/40	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381:100::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381:180::/41	AS20057	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:381:410::/44	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:420::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:424::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:428::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:42c::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:430::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:434::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:438::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:440::/44	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:450::/44	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:478::/46	AS64011	—	—	Before monitoring	2026-10-24 06:23	Announcing
2600:381:3900::/40	AS13965	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:384:100::/40	AS7287	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing
2600:384:500::/40	AS7287	AT&T Enterprises, LLC	United States	Before monitoring	2026-10-24 06:23	Announcing

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: 2600:300::/24
Country: United States
Allocation date: 2011-10-21
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.