2804:8520:fc0::/42

Currently announced by AS272559 JAPANET TELECOM, in the routed prefix 2804:8520::/32.

Routing data · Nov 1, 2026, 18:24 UTC

ASN historyEvery routed prefix covering 2804:8520:fc0::/42

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2804:8520:fc0::/42	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-11-01 00:27	Stopped
2804:8520:f80::/41	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-11-01 00:27	Stopped
2804:8520::/35	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-10-31 20:25	Stopped
2804:8520::/34	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-10-31 20:25	Stopped
2804:8520::/33	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-10-31 20:25	Stopped
2804:8520::/32	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-11-01 18:24	Announcing

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2804:8520:fc0::/43	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-11-01 00:27	Stopped
2804:8520:fe0::/43	AS272559	JAPANET TELECOM	Brazil	Before monitoring	2026-11-01 00:27	Stopped

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-11-01 02:25	2804:8520:fc0::/42	Withdrawal	AS272559	JAPANET TELECOM	—	Brazil
2026-11-01 02:25	2804:8520:f80::/41	Withdrawal	AS272559	JAPANET TELECOM	—	Brazil
2026-10-31 22:25	2804:8520::/35	Withdrawal	AS272559	JAPANET TELECOM	—	Brazil
2026-10-31 22:25	2804:8520::/34	Withdrawal	AS272559	JAPANET TELECOM	—	Brazil
2026-10-31 22:25	2804:8520::/33	Withdrawal	AS272559	JAPANET TELECOM	—	Brazil

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.