AS24278 USEN CORPORATION

USEN-NET - USEN CORPORATION · registered in Japan

IPv4 addresses20,4802 prefixes · <0.001% of announced IPv4

Rank in Japan#246largest network in JP by IPv4 space, of 724 · 0.01% of JP

Rank worldwide#6,056of 79,396 networks with IPv4

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

CountryJapan745 ASNs registered there

Open AS24278 in ASN lookup Look up an IP in this network (118.238.128.1) All networks in Japan

IPv4 prefixes

All 2 prefixes, in address order.

118.238.128.0/18
125.63.32.0/20

IPv6 prefixes

All 1 prefix.

2400:f400::/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