AS37917 University of Tsukuba

UTINS - University of Tsukuba · registered in Japan

IPv4 addresses132,0963 prefixes · 0.004% of announced IPv4

Rank in Japan#60largest network in JP by IPv4 space, of 724 · 0.08% of JP

Rank worldwide#1,507of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS37917 in ASN lookup Look up an IP in this network (130.158.0.1) All networks in Japan

IPv4 prefixes

All 3 prefixes, in address order.

130.158.0.0/16
133.51.0.0/16
163.220.252.0/22

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS17529#57 MediaCat - STARCAT Co .,LTD.135,424

AS7670#58 CTNET - Enecom,Inc.134,656

AS2504#59 NCA5 - Kyoto University132,096

AS7509#61 HINES - Hokkaido University131,328

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

AS38635#63 KEIO-NET - Keio University131,072

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