I had this set up before, but have forgotten how I did it.
I had home.mydomain.com which redirected to np-ip.com which redirected to my ip address.
Is it a CNAME record I want? I have one set up but it isn't resolving yet (I may just be impatient). I can't for a url forward.
The no-ip to home bit is working...just not the home.mydomain.com to noip I expect. I'm not using port 80 but others.