AS63781 Kobayashi Family Net LLP

KFNET-AS - Kobayashi Family Net LLP · registered in Japan

IPv4 addresses5121 prefixes · <0.001% of announced IPv4

Rank in Japan#581largest network in JP by IPv4 space, of 724 · <0.01% of JP

Rank worldwide#46,521of 79,396 networks with IPv4

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

CountryJapan745 ASNs registered there

Open AS63781 in ASN lookup Look up an IP in this network (103.143.136.1) All networks in Japan

IPv4 prefixes

All 1 prefix, in address order.

103.143.136.0/23

IPv6 prefixes

All 1 prefix.

2405:5340::/32

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AS63797#584 CUTEIP - CuteIP512

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