Pow uses an interesting trick to get the *.dev urls resolving to localhost: it adds /etc/resolver/dev which acts as a resolv.conf for the .dev domain, and point

Pow uses an interesting trick to get the *.dev urls resolving to localhost: it adds /etc/resolver/dev which acts as a resolv.conf for the .dev domain, and points to the nameserver at 127.0.0.1 port 20560. The Pow server binds to that port and acts like a nameserver for .dev domains.