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AS131159

Yamagata University

APNIC JP Announced
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Organization
Yamagata University
AS-YAMAGATAU
Registered
Oct 03, 2008
18 years ago
IPv4 Prefixes
6
65,536 addresses
IPv6 Prefixes
1
1 × /48
BGP Neighbours
3
2 upstream/peer · 0 downstream · 1 collector-only

Registration

The registry's RDAP record for this AS number could not be retrieved; it is looked up again automatically.

AS Number AS131159 AS Name AS-YAMAGATAU Country Japan (JP) Registry APNIC Allocated Oct 03, 2008 AS Description AS-YAMAGATAU - Yamagata University, JP

IPv4 Prefixes

6 prefixes · 65,536 addresses · 1 top-level Routing data as of 2026-10-07 08:00 UTC

PrefixRangeAddresses
133.24.0.0/16133.24.0.0 – 133.24.255.25565,536
133.24.0.0/18133.24.0.0 – 133.24.63.25516,384
133.24.64.0/18133.24.64.0 – 133.24.127.25516,384
133.24.128.0/18133.24.128.0 – 133.24.191.25516,384
133.24.192.0/19133.24.192.0 – 133.24.223.2558,192
133.24.248.0/23133.24.248.0 – 133.24.249.255512

IPv6 Prefixes

1 prefix · 1 × /48 Routing data as of 2026-10-07 08:00 UTC

PrefixAddresses
2001:df0:25e::/48280

BGP Neighbours

3 unique neighbours · 2 upstream/peer · 0 downstream · 1 collector-only. A neighbour can be seen on more than one side. Rows are ordered by AS paths: the number of BGP paths seen by RIPE RIS that contain the adjacency. Sightings count each IPv4/IPv6 route with the adjacency once per RIS peer that sees it (routes × peers), so they show how widely it is seen, not how many distinct routes it carries.

Upstream & peer side (2)

Networks seen to the left of this AS in BGP paths, toward the route collectors — typically its transit providers (upstreams) and peers.

ASNameAS pathsIPv4 sightingsIPv6 sightings
AS2907SINET-AS - Research Organization of Information and Systems, National Institute of Informatics6491,822257
AS150369Infal - TelHi Corporation7120988

Collector-only (1)

Networks seen to the left of this AS only when they peer directly with a RIPE RIS route collector, so the adjacency may be an artefact of that peering; many of them also appear on the downstream side.

ASNameAS pathsIPv4 sightingsIPv6 sightings
AS59105HOMENOC - Home NOC Operators Group121