AS23623 Chuo University

CHUO-U - Chuo University · registered in Japan

IPv4 addresses65,5361 prefixes · 0.002% of announced IPv4

Rank in Japan#141largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#3,253of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS23623 in ASN lookup Look up an IP in this network (133.91.0.1) All networks in Japan

IPv4 prefixes

All 1 prefix, in address order.

133.91.0.0/16

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS18125#138 MAFFIN - Tsukuba Business-Academia Cooperation Support Center, Agriculture, Forestry and Fisheries Research Council Secretariat, Ministry of Agriculture, Forestry and Fisheries65,536

AS18276#139 KAISER - Kansai University65,536

AS23615#140 KUSANAGI - University of Shizuoka65,536

AS23807#142 RITSUMEI - Ritsumeikan University65,536

AS24248#143 ASN-WADAI-U - Wakayama University65,536

AS24254#144 KYOTO-SU - Kyoto Sangyo University65,536

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