Using a host name instead if IP?

Norman Segall norman.segall "at"
Sat Jan 31 18:04:00 2004

The host I wish to connect to, ip address changes quite often. The router is
registered with dyndns so I can always get the current ip address, but it's
a bit of a pain. I have tried entering the host name eg:, but I get the popup "failed to get server
address....". I assume that I cant therefore use this method? Is there
anything else I could do?