AS131159

Name: AS131159 — Yamagata University
Creator: ipdex

Yamagata University Education registered in Japan

6IPv4 prefixes

1IPv6 prefixes

100%RPKI-valid

#43,801AS Rank

327/327RIS visibility

#326Rank in Japan

2008-10-03Allocated

Yamagata University (AS131159) — Education, registered in Japan. announces 6 IPv4 prefixes + 1 IPv6 prefixes. Rank in Japan: #326. Allocated: 2008-10-03.

IPv4 6IPv6 1

Announced prefixes · 7

v4 133.24.0.0/16 valid
v4 133.24.0.0/18 valid
v4 133.24.128.0/18 valid
v4 133.24.192.0/19 valid
v4 133.24.248.0/23 valid
v4 133.24.64.0/18 valid
v6 2001:df0:25e::/48 valid

RPKI: rpki.cloudflare.com · 2026-06-17

Routing: 6 IPv4 · 1 IPv6 announced · RIS visibility 327/327 RIS peers · RIPEstat · 2026-06-17

Prefix history

Announced prefixes Source: ipdex daily snapshot · sparse rows, value holds until the next change (steps)

Data table

Day	Announced prefixes
2026-06-12	7
2026-06-13	7

Internet Exchanges · 1

JCIX Japan 20 Gbps

AS topology · Customer cone 1

Providers · 2

AS2907 Research Organization of Information and Systems, National Institute of Informatics
AS150369 TelHi Corporation

Peers · 1

AS59105 Home NOC Operators Group

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