Agreed, it's a last mile problem.

When I get a letter addressed to 914 instead of 918, I know which house it's supposed to go to. No effort required after step one: address envelope.

It'd be easy enough to hand out your address as a url, "just whois me." But to ask the postal systems of every single country on earth to do the translation for you is over the top (steps two through n). Put the onus on the user (sender) to do the google.com == 1600 Amphitheatre Parkway translation.

(I smell a weekend webapp)