2001:579::/37

Currently announced by AS22773 Cox Communications, in the routed prefix 2001:579::/37.

Current ASN: AS22773; Cox Communications
Routed prefix: 2001:579::/37; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: ARIN; United States · 2001:578::/30

Routing data · Nov 8, 2026, 12:23 UTC

ASN historyEvery routed prefix covering 2001:579::/37

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:579::/37	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:578::/30	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing

More specific routes32 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2001:579::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:8::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:10::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:18::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:1c::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:20::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:24::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:2c::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:40::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:4c::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:50::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:54::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:84::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:88::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:90::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:94::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:98::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:9c::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:c0::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:c8::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:cc::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:d8::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:dc::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:e0::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:e4::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:fe::/48	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:ff::/48	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:100::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:104::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:114::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:118::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing
2001:579:124::/46	AS22773	Cox Communications	United States	Before monitoring	2026-11-08 12:23	Announcing

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

Look up another address

RIR allocation record

Registry: ARIN
Allocated block: 2001:578::/30
Country: United States
Allocation date: 2003-02-06
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.