From the NannyMUD documentation

LAST CHANGE

2000-12-11

FUNCTION

NAME
        query_ip_port - give the port part of the connecting socket


SYNTAX
	int query_ip_port(void|object player)

DESCRIPTION
	Gives the port part of the socket through which the player
	connects to the game.


NOTE
	This function demands an external process to be active on the
	machine running the gamedriver.


SEE ALSO
        query_ip_number in efun/player_related/query_ip_number