AS131158 Nara Institute of Science and Technology, National University Corporation

NAIST-AS - Nara Institute of Science and Technology, National University Corporation · registered in Japan

IPv4 addresses66,0482 prefixes · 0.002% of announced IPv4

Rank in Japan#111largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#2,721of 79,396 networks with IPv4

IPv61 x /481 prefixes

CountryJapan745 ASNs registered there

Open AS131158 in ASN lookup Look up an IP in this network (163.221.0.1) All networks in Japan

IPv4 prefixes

All 2 prefixes, in address order.

163.221.0.0/16
192.218.128.0/23

IPv6 prefixes

All 1 prefix.

2001:df3:540::/48

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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