There is a standard SSDP multicast address and port ( used for local area network communication. The Roku device responds to M-SEARCH queries on this IP address and port. To query for a Roku device IP address, send the following HTTP request to port 1900:

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Is there a way to set a static IP and DNS address? : Roku

Nov 12, 2019 How to find your Roku device's IP address in 3 ways The System Info page has the IP address and other networking details. How to find a Roku IP address in a web browser. Another way to find the IP address is using a free extension for the Chrome