Hi, can anyone give me advice on the following?

My company runs an Internet server and we host email and www for a number of clients. Recently we have been approached to supply a domain forwarding service.

Some clients have sites running on free server space provided by their existng ISP. They want to have a domain name registered, and then have users use that domain name to enter their sites.

The user would type www.coname.com into their browser, this would get directed through DNS to our server, then we simply need to do a redirect (in a frame for appearance sake) to the clients site on another server (using the free webspace provided by their ISP).

The question is can I provide this service to a number of clients using only 1 of my precious IP addresses. I don't want to have to use a separate IP address for each domain redirection.

Is this possible?