Change IP shown in Cam viewers address BAr

Hi, I use WebcamXP but am trying to find ways of not showing the external IP of my computer in their address bar when someone has clicked on an access link so that I can block access by changing the link as and when I choose.
It's not a normal Hide IP problem as there must be access to the Ip as the computer is acting as server but I'm not keen on this unchangeable number being known when I might not want that person to be able to access it in future.
At the moment the link is the IP address with the port number but changing the port wouldn't be enough. I would like it to be a normal name that could be changed at the program end and so not give access if it no longer matched the redirection link
Clear as mud huh? Hope it is.
Many thanks.

Welwyn