ıpdex
Japan

AS37917

University of Tsukuba Unknown registered in Japan

3IPv4 prefixes
0IPv6 prefixes
#29,082AS Rank
327/327RIS visibility
#540Rank in Japan
2006-01-30Allocated

University of Tsukuba (AS37917) — Unknown, registered in Japan. announces 3 IPv4 prefixes + 0 IPv6 prefixes. Rank in Japan: #540. Allocated: 2006-01-30.

Announced prefixes · 3

Routing: 3 IPv4 · 0 IPv6 announced · RIS visibility 327/327 RIS peers · RIPEstat · 2026-06-17

Prefix history

0 1 2 3 2026-06-12 2026-06-13
Announced prefixes Source: ipdex daily snapshot · sparse rows, value holds until the next change (steps)
Data table
DayAnnounced prefixes
2026-06-123
2026-06-133

AS topology · Customer cone 1

Providers · 2

  • AS2907 Research Organization of Information and Systems, National Institute of Informatics
  • AS63770 Industrial Cyber Security Center of Excellence
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