IP-Check for different Hostnames/IPs

[Saberhagen]

Hello,

i'm searching for a security-addon for vb. It should check the member-host/ip for changes in a short time. Like different countries (or country-codes), different providers and multiple logins with different hotnames. (ok changes are possible after reconnect/proxy....)
So i can track if someone shares logindata with another person. (member a use forum with a german hostname, 1 hours later with a france hostname, ...

Thanks