With this plugin you will be able to prevent members from logging on different IP's. There are two options:
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member must be logged out from a previous IP before he will be able to login from a current IP - there will be error message displayed.
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if member try login from a x.x.x.x IP then he will be logged out automatically from all devices logged with a different IP than x.x.x.
Źródło: https://invisioncommunity.com/files/file/9121-dp43-prevent-login-same-ips/
czw, 13 wrzesień 2018