Internet Direct (Indy) Version 9.0.2 Beta
TIdUDPServer.DefaultPort
Port number used to listen for new connections.

property DefaultPort: integer;
Description
DefaultPort is an Integer property that identifies the port number used for new socket bindings created by the server. The value of DefaultPort is read from and written to Bindings.DefaultPort.

TIdUDPServer uses the DefaultPort number to bind the allocated datagram socket handle when the Active property to set to True.