I Need the IP for my Roku serial number C4394C754949
If you mean IP address, that's assigned when it connects to the network. It doesn't have one until then.
Maybe if you said what you're actually trying to do, we could help.
DBDukesRoku Community Streaming ExpertNote: I am not a Roku employee.
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There is a menu option on the Roku device that will tell you. Try a few under system, you should easily find it.