AS2907 Research Organization of Information and Systems, National Institute of Informa

A network in Japan. Here are the size of its IP ranges and the data used for visitor checks.

Country

IPv4 addresses

8,769,536 addresses

IPv4 ranges

389

IPv6 ranges

Visitor check data

This network mainly serves home, office and mobile lines. VPN servers are counted only when they are on the public list. How checks work

Japan8,759,040 addresses

United States9,472 addresses

Canada1,024 addresses

Up to 20, largest first (389 in total).

133.81.0.0 ~ 133.86.255.255

133.14.0.0 ~ 133.17.255.255

133.37.0.0 ~ 133.39.255.255

133.44.0.0 ~ 133.46.255.255

133.94.0.0 ~ 133.96.255.255

133.102.0.0 ~ 133.104.255.255

133.7.0.0 ~ 133.8.255.255

133.20.0.0/15

133.29.0.0 ~ 133.30.255.255

133.34.0.0/15

133.48.0.0/15

133.57.0.0 ~ 133.58.255.255

133.62.0.0/15

133.72.0.0/15

133.77.0.0 ~ 133.78.255.255

133.98.0.0/15

150.42.0.0/15

150.83.0.0 ~ 150.84.255.255

150.99.0.0 ~ 150.100.255.255

160.11.0.0 ~ 160.12.255.255

Data: DB-IP (CC BY 4.0), public VPN server list, Tor Project exit list · as of 2026-10-13