181.66.0.0/19

Currently announced by AS6147 Telefonica Del Perú, in the routed prefix 181.66.0.0/19.

Current ASN: AS6147; Telefonica Del Perú
Routed prefix: 181.66.0.0/19; Most specific route covering this prefix
ASNs over time: 1; 2 announcement records
RIR allocation: LACNIC; Peru · 181.66.0.0/15

Routing data · Nov 8, 2026, 12:23 UTC

ASN historyEvery routed prefix covering 181.66.0.0/19

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
181.66.0.0/19	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.0.0/16	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing

More specific routes20 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
181.66.0.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.2.0/24	AS6147	Telefonica Del Perú	Peru	2026-10-29 10:22	2026-11-08 12:23	Announcing
181.66.3.0/24	AS6147	Telefonica Del Perú	Peru	2026-10-29 10:22	2026-11-08 12:23	Announcing
181.66.5.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.6.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.8.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.9.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.10.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.14.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.15.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.16.0/24	AS6147	Telefonica Del Perú	Peru	2026-10-29 10:22	2026-11-08 12:23	Announcing
181.66.17.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.18.0/24	AS6147	Telefonica Del Perú	Peru	2026-10-29 10:22	2026-11-08 12:23	Announcing
181.66.19.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.20.0/24	AS6147	Telefonica Del Perú	Peru	2026-10-29 10:22	2026-11-08 12:23	Announcing
181.66.23.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.24.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.28.0/24	AS6147	Telefonica Del Perú	Peru	2026-10-29 10:22	2026-11-08 12:23	Announcing
181.66.29.0/24	AS6147	Telefonica Del Perú	Peru	Before monitoring	2026-11-08 12:23	Announcing
181.66.31.0/24	AS6147	Telefonica Del Perú	Peru	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.

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RIR allocation record

Registry: LACNIC
Allocated block: 181.66.0.0/15
Country: Peru
Allocation date: 2012-08-10
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.