AS18121 Ishikawa Computer Center Co.,LTD.

INCL - Ishikawa Computer Center Co.,LTD. · registered in Japan

IPv4 addresses22,52810 prefixes · <0.001% of announced IPv4

Rank in Japan#231largest network in JP by IPv4 space, of 724 · 0.01% of JP

Rank worldwide#5,742of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryJapan745 ASNs registered there

Open AS18121 in ASN lookup Look up an IP in this network (103.241.208.1) All networks in Japan

IPv4 prefixes

All 10 prefixes, in address order.

103.241.208.0/23
180.94.192.0/20
180.94.208.0/21
202.222.32.0/19
219.121.224.0/20
219.121.240.0/21
219.121.248.0/24
219.121.250.0/23
219.121.252.0/23
219.121.254.0/24

IPv6 prefixes

All 1 prefix.

2404:a00::/32

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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