AS38635 Keio University

KEIO-NET - Keio University · registered in Japan

IPv4 addresses131,0722 prefixes · 0.004% of announced IPv4

Rank in Japan#63largest network in JP by IPv4 space, of 724 · 0.08% of JP

Rank worldwide#1,575of 79,396 networks with IPv4

IPv62 x /482 prefixes

CountryJapan745 ASNs registered there

Open AS38635 in ASN lookup Look up an IP in this network (131.113.0.1) All networks in Japan

IPv4 prefixes

All 2 prefixes, in address order.

131.113.0.0/16
133.27.0.0/16

IPv6 prefixes

All 2 prefixes.

2001:df0:eb::/48
2001:df2:c900::/48

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS37917#60 UTINS - University of Tsukuba132,096

AS7509#61 HINES - Hokkaido University131,328

AS17687#62 NICE - National University Corporation Nagoya University131,328

AS9355#64 NICT - National Institute of Information and Communications Technology131,072

AS4729#65 JAEA - Japan Atomic Energy Agency131,072

AS63802#66 MIKAKA-EAST - Nippon Telegraph and Telephone East Corporation131,072

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