AS2501

Name: AS2501 — The University of Tokyo
Creator: ipdex

The University of Tokyo Unknown registered in Japan

4IPv4 prefixes

2IPv6 prefixes

#13,403AS Rank

327/327RIS visibility

#363Rank in Japan

2002-04-05Allocated

The University of Tokyo (AS2501) — Unknown, registered in Japan. announces 4 IPv4 prefixes + 2 IPv6 prefixes. Rank in Japan: #363. Allocated: 2002-04-05.

IPv4 4IPv6 2

Announced prefixes · 6

v4 130.69.0.0/16 unknown
v4 133.11.0.0/16 unknown
v4 157.82.0.0/16 unknown
v4 192.51.208.0/20 unknown
v6 2404:d540:1::/48 unknown
v6 2404:d540::/32 unknown

Routing: 4 IPv4 · 2 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	6
2026-06-13	6

AS topology · Customer cone 1

Providers · 2

AS2500 WIDE Project
AS2907 Research Organization of Information and Systems, National Institute of Informatics

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