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The hostname can only be given as an IP address; DNS names aren't permitted. The port while in the hostname part is definitely the TCP listening port. If the TCP and UDP (discovery) ports differ, the UDP port is specified as a question parameter "discport"It's the ETH formatted address, you will note “TU4isedhHXquDQQvyK4CVGNRDWTvwqTpxR�?followi