AS9591 National Institute for Fusion Science

NIFS - National Institute for Fusion Science · registered in Japan

IPv4 addresses65,5369 prefixes · 0.002% of announced IPv4

Rank in Japan#132largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#3,112of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS9591 in ASN lookup Look up an IP in this network (133.75.0.1) All networks in Japan

IPv4 prefixes

All 9 prefixes, in address order.

133.75.0.0/17
133.75.128.0/18
133.75.192.0/19
133.75.224.0/21
133.75.232.0/24
133.75.233.0/24
133.75.234.0/23
133.75.236.0/22
133.75.240.0/20

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS2508#129 kyushu-u - Kyushu University65,536

AS2513#130 JST - Japan Science and Technology Agency65,536

AS2526#131 HITNET - Hitachi, Ltd. IT strategy & Digital Integration Division, Employee Experience Office65,536

AS17510#133 ISID - INFORMATION SERVICES INTERNATIONAL - DENTSU, LTD.65,536

AS17512#134 JAL - Japan Airlines Co.,Ltd.65,536

AS17946#135 GUCC - Gifu 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