AS15937 — ADIF

AS15937 announces 1 IPv4 prefixes covering 8,192 addresses and 0 IPv6 prefixes.

About this network

The rail infrastructure manager announces the train operator's address blocks alongside its own.

What it's used for

• A railway infrastructure body's network. Four IPv4 prefixes announced from Spain, no IPv6, eight thousand one hundred and ninety-two addresses, across two observed BGP neighbours.

Notable

• Three of the four blocks are registered to the national train operating company, under its own netname, while the announcement comes from the infrastructure manager's number.
• The fourth is the holder's own, and its registrant list runs to three entries: an administrative contact, a contact role, and an abuse role, all built from the same four letters.
• The holder's name appears twice in a row in the routing record, once as the handle and once as the company, with nothing else to distinguish them.
• The four prefixes are all pieces of one range, with a /20 announced whole and three smaller pieces announced separately inside the space next to it.
• Twelve addresses were queried for reverse DNS and none returned a name.

Interesting

• Splitting a railway into a body that owns the track and a company that runs the trains is a policy choice, and it leaves a mark here: two organisations, one network, because signalling, stations and ticketing do not divide as cleanly as the law does.
• A network with no reverse names at all across twelve addresses belongs to somebody who treats the address space as internal, whatever the routing table says.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 213.144.32.0/19

Upstream networks

• AS12479 Orange Espagne SA
• AS12357 VODAFONE ESPANA S.A.U.

Adjacent networks

• AS12479 Orange Espagne SA
• AS12357 VODAFONE ESPANA S.A.U.

Routing security

• RPKI: 0 valid, 0 invalid and 2 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 2 route objects.
• Listed in as-sets: AS-12715-CUSTOMERS, AS-AUNANET, AS-BTIGSCUSTES, AS-COMUNITEL, AS-CWEUROPECUSTES, AS-GBLXEU, AS-ONO-UPS, AS12479:AS-CUSTOMERS.