AS9466 UUNET Japan Limited

UUNET-JP-AP - UUNET Japan Limited · registered in Japan

IPv4 addresses82,94430 prefixes · 0.003% of announced IPv4

Rank in Japan#82largest network in JP by IPv4 space, of 724 · 0.05% of JP

Rank worldwide#2,122of 79,396 networks with IPv4

IPv6512 x /482 prefixes

CountryJapan745 ASNs registered there

Open AS9466 in ASN lookup Look up an IP in this network (103.3.198.1) All networks in Japan

IPv4 prefixes

All 30 prefixes, in address order.

103.3.198.0/24
103.109.16.0/24
138.198.0.0/22
138.198.4.0/24
138.198.5.0/24
138.198.6.0/23
138.198.8.0/21
138.198.16.0/20
138.198.32.0/19
138.198.64.0/18
138.198.128.0/17
144.250.40.0/24
202.1.128.0/19
202.125.0.0/23
202.125.2.0/24
202.125.6.0/23
203.5.217.0/24
203.6.31.0/24
203.6.32.0/23
203.6.36.0/22
203.6.64.0/23
203.6.67.0/24
203.6.68.0/22
203.6.72.0/23
203.6.75.0/24
203.6.76.0/22
203.6.118.0/23
203.6.120.0/23
203.10.217.0/24
203.11.0.0/24

IPv6 prefixes

All 2 prefixes.

2401:6bff::/40
2401:6bff:8000::/40

Similar-sized networks in Japan

ASNNameIPv4 addresses

AS58791#79 GMO-I-R2 - GMO Internet, Inc.86,784

AS17514#80 AICS - Otsuka Corp.83,968

AS9600#81 SONYTELECOM - So-net Corporation82,944

AS7511#83 SYNAPSE - SYNAPSE Co.,Ltd.78,848

AS9622#84 KCT - Kurashiki Cable TV78,848

AS18260#85 e-catv - EHIME CATV CO.,LTD.78,592

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