AS63777 National Institutes of Natural Sciences National Astronomical Observatory of JAPAN

STARCLUSTER - National Institutes of Natural Sciences National Astronomical Observatory of JAPAN · registered in Japan

IPv4 addresses65,5361 prefixes · 0.002% of announced IPv4

Rank in Japan#154largest network in JP by IPv4 space, of 724 · 0.04% of JP

Rank worldwide#3,404of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS63777 in ASN lookup Look up an IP in this network (133.40.0.1) All networks in Japan

IPv4 prefixes

All 1 prefix, in address order.

133.40.0.0/16

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS55380#151 KAINS - Kanazawa University65,536

AS58652#152 Kochi-U-NET - Kochi University65,536

AS59104#153 SOKAU-AS - Soka University65,536

AS131897#155 EHIME-U - National University Corporation ,Ehime University65,536

AS131919#156 MEIJI-NET - Meiji University65,536

AS131930#157 TBS-NET - Tokyo Broadcasting System Television, Inc.65,536

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