[angrais]

Would it be possible to use hostnames rather than IP addresses then you'd not have to worry as the resolution would be done for you?

[deathanatos]

That only adds a layer of indirection to the same problem. You can refer to your laptop by hostname, but something have to update the hostname's record when the laptop moves about. That could be a daemon on the laptop [yada yada] but now you've added a ton of complexity. (And there's still the problem of NAT: your laptop might not be on the Internet.)