37.133.0.0/16

Currently announced by AS12479 Orange Spain, in the routed prefix 37.133.0.0/16.

Current ASN: AS12479; Orange Spain
Routed prefix: 37.133.0.0/16; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: RIPENCC; Spain · 37.132.0.0/14

Routing data · Nov 1, 2026, 22:23 UTC

ASN historyEvery routed prefix covering 37.133.0.0/16

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
37.133.0.0/16	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing

More specific routes66 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
37.133.0.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.4.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.8.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.12.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.16.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.20.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.24.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.28.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.32.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.36.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.40.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.44.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.48.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.50.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.52.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.56.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.60.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.64.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.68.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.72.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.76.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.80.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.88.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.92.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.96.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.100.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.104.0/24	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.105.0/24	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.107.0/24	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.108.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.112.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.116.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.120.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.124.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.126.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.128.0/24	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.129.0/24	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.130.0/24	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.132.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.136.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.144.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.148.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.152.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.156.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.160.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.164.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.168.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.172.0/22	AS12479	Orange Spain	Spain	2026-10-29 06:23	2026-11-01 22:23	Announcing
37.133.176.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.180.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.184.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.186.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.188.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.196.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.200.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.204.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.208.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.212.0/23	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.216.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.220.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.224.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.228.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.232.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.240.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.248.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing
37.133.252.0/22	AS12479	Orange Spain	Spain	Before monitoring	2026-11-01 22:23	Announcing

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

Look up another address

RIR allocation record

Registry: RIPENCC
Allocated block: 37.132.0.0/14
Country: Spain
Allocation date: 2012-02-21
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.