AS18129 OKAYAMA NETWORK INC.

ONI - OKAYAMA NETWORK INC. · registered in Japan

IPv4 addresses32,2568 prefixes · 0.001% of announced IPv4

Rank in Japan#207largest network in JP by IPv4 space, of 724 · 0.02% of JP

Rank worldwide#4,885of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryJapan745 ASNs registered there

Open AS18129 in ASN lookup Look up an IP in this network (27.109.96.1) All networks in Japan

IPv4 prefixes

All 8 prefixes, in address order.

27.109.96.0/21
103.154.6.0/23
119.47.96.0/20
180.200.248.0/22
202.70.224.0/19
202.238.16.0/20
218.231.160.0/19
219.111.208.0/20

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS9357#204 FNC - NRI SecureTechnologies, Ltd.32,768

AS18150#205 SNI-JP - NetComBB Co.,Ltd.32,768

AS131915#206 WINDE - Hamamatsu Cable Television .Inc32,768

AS9607#208 BBTower - BroadBand Tower, Inc.31,744

AS131916#209 BAYNET - Tokyo Bay Network Co.,Ltd.31,744

AS4675#210 U-NETSURF - UNIADEX, LTD.30,976

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