AS45688 The University of Tokyo Interfaculty Initiative in Information Studies

UT-NSRG - The University of Tokyo Interfaculty Initiative in Information Studies · registered in Japan

IPv4 addresses3,5925 prefixes · <0.001% of announced IPv4

Rank in Japan#418largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#16,878of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS45688 in ASN lookup Look up an IP in this network (133.69.160.1) All networks in Japan

IPv4 prefixes

All 5 prefixes, in address order.

133.69.160.0/22
133.69.167.248/29
133.69.168.0/21
133.69.176.0/24
133.69.184.0/24

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IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources