Internet Direct (Indy) Version 9.0.2 Beta
TIdMappedPortTCP.MappedPort
Port number for mapped connections to the host.

property MappedPort: integer;
Description
MappedPort is an Integer property that represents the port number used by TIdMappedPortTCP to establish a connection with the remote host computer. MappedPort is assigned to the port number for the TCP client created by TIdMappedPortTCP.