Routers can be tricky though, because not all are the same. The most common home router, (Linksys 4 port), really only has 1 IP address, and then makes a whole subsystem of IPs once that you get into the network. From this system, All computers are treated as the same computer once they are logged on...
But depending on how you set it up, you can have multiple external IP addresses in the same network, which is almost always used for large businesses, as well as sometimes for home networks. In this system you can have seperate IPs and therefor seperate entities on the PP and Empire database.
And I think that one of the only methods they use to track you is IP and cookies.
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