AS9999 AT TOKYO Corporation

ATTOKYO - AT TOKYO Corporation · registered in Japan

IPv4 addresses20,22410 prefixes · <0.001% of announced IPv4

Rank in Japan#252largest network in JP by IPv4 space, of 724 · 0.01% of JP

Rank worldwide#6,113of 79,396 networks with IPv4

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

CountryJapan745 ASNs registered there

Open AS9999 in ASN lookup Look up an IP in this network (110.44.20.1) All networks in Japan

IPv4 prefixes

All 10 prefixes, in address order.

110.44.20.0/22
119.59.64.0/21
165.100.192.0/20
202.13.124.0/22
202.243.223.0/24
203.80.6.0/23
203.89.128.0/22
203.223.24.0/21
211.132.0.0/20
219.99.128.0/20

IPv6 prefixes

All 1 prefix.

2405:1800::/32

Similar-sized networks in Japan

ASNNameIPv4 addresses

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AS59107#251 HTV-NET - Hachinohe Cable Television Co.20,480

AS17516#253 NTTCOMWARE - NTT COMWARE CORPORATION19,456

AS17957#254 CTS - SOUTH TOKYO CABLETELEVISION19,456

AS59109#255 HITCLOUD - Hitachi,Ltd., Managed & Platform Services Business Division19,456

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