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Hey Tiffany, no there is no way to check, your router might have logs as to who connected, but will only show you a local IP which is no good. I Also think theres a high chance you were not hacked....and something went nutty with the router. Hackers do not, and will not change a routers password, they want to leave it as is, so they can keep getting back in. It would like a robber breaking in, then going outside and nailing the door shut.