[ganstyles]

I don't think this would work. How would one get around the ISP's NAT to expose your address to the wider internet? At least, without potentially paying the ISP extra or going through a (relatively) lot of trouble to monitor/manage where your DNS is pointing. If I am way off base on this, please elucidate.

[jgalentine007]

Dynamic DNS has been a thing for ages and it is trivial to PAT on most any firewall you may have hooked up to a modem in bridge mode.

[StavrosK]

Not all ISPs have NATs, I guess.

[BenjiWiebe]

In the US, most don't have NATs, in my experience.