187.31.47.0/24

Currently announced jointly by AS14571 Oi S.A. - Em Recuperacao Judicial, AS268188 ROBSON LIMA DA SILVA PROVEDOR DE INTERNET, in the routed prefix 187.31.47.0/24.

Current ASN: AS14571 AS268188; Oi S.A. - Em Recuperacao Judicial
Routed prefix: 187.31.47.0/24; Most specific route covering this prefix
ASNs over time: 2; 3 announcement records
RIR allocation: LACNIC; Brazil · 187.31.40.0/21

Routing data · Oct 22, 2026, 20:21 UTC

ASN historyEvery routed prefix covering 187.31.47.0/24

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
187.31.47.0/24	AS14571	Oi S.A. - Em Recuperacao Judicial	Brazil	Before monitoring	2026-10-22 20:21	Announcing
187.31.47.0/24	AS268188	ROBSON LIMA DA SILVA PROVEDOR DE INTERNET	Brazil	2026-10-22 18:21	2026-10-22 20:21	Announcing
187.31.0.0/16	AS14571	Oi S.A. - Em Recuperacao Judicial	Brazil	Before monitoring	2026-10-22 20:21	Announcing

More specific routes0 total

No more specific routes inside this prefix.

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-10-22 18:21	187.31.47.0/24	Origin added	AS268188	ROBSON LIMA DA SILVA PROVEDOR DE INTERNET	AS14571	Brazil

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RIR allocation record

Registry: LACNIC
Allocated block: 187.31.40.0/21
Country: Brazil
Allocation date: 2008-12-12
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.