Use one of the million dynamic DNS services available....
Which one do you recommend?
I'm using Dyn now but can't get iVMS-4500 to work. Before HikVision decided to terminate their original DDNS service, I was using that successfully with iVMS. In the app, I don't know what settings to use. Is it "IP/Domain" or "IP Server"? For the former, it asks for address and port. For the later, server address and identifier, whatever that means.