2801:16:400::/48

Currently announced jointly by AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP, AS274211 Contraloria Departamental San Andres, in the routed prefix 2801:16:400::/48.

Current ASN: AS3816 AS274211; COLOMBIA TELECOMUNICACIONES S.A. ESP
Routed prefix: 2801:16:400::/48; Most specific route covering this prefix
ASNs over time: 2; 2 announcement records
RIR allocation: LACNIC; Colombia · 2801:16:400::/48

Routing data · Nov 2, 2026, 08:23 UTC

ASN historyEvery routed prefix covering 2801:16:400::/48

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
2801:16:400::/48	AS3816	COLOMBIA TELECOMUNICACIONES S.A. ESP	Colombia	2026-10-29 14:19	2026-11-02 08:23	Announcing
2801:16:400::/48	AS274211	Contraloria Departamental San Andres	Colombia	2026-10-29 14:19	2026-11-02 08:23	Announcing

More specific routes0 total

No more specific routes inside this prefix.

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-10-29 14:19	2801:16:400::/48	New announcement	AS274211	Contraloria Departamental San Andres	—	Colombia

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RIR allocation record

Registry: LACNIC
Allocated block: 2801:16:400::/48
Country: Colombia
Allocation date: 2025-09-26
Status: assigned

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.