2a12:f8c0:2000::/48

Currently announced by AS10104 BV K Computer, in the routed prefix 2a12:f8c0:2000::/48.

Current ASN: AS10104; BV K Computer
Routed prefix: 2a12:f8c0:2000::/48; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: RIPENCC; Japan · 2a12:f8c0::/29

Routing data · Nov 11, 2026, 20:24 UTC

ASN historyEvery routed prefix covering 2a12:f8c0:2000::/48

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2a12:f8c0:2000::/48	AS10104	BV K Computer	Laos	2026-10-26 06:21	2026-11-11 20:24	Announcing

No more specific routes inside this prefix.

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-10-26 06:21	2a12:f8c0:2000::/48	New announcement	AS10104	BV K Computer	—	Laos

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

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.