DynDNS is no longer free. Don't worry though, DuckDNS offers the exact same service.
Now if only there was a simple way to automate the updating of my IP address to my DuckDNS host name. Oh wait -- there is!
$ brew tap jzelinskie/duckdns
$ brew install duckdns
- Configure - make a $HOME/.duckdns config file like so:
DOMAIN="example,example2"
TOKEN="11111111-1111-1111-1111-111111111111"
- Run and register to launch at login
$ brew services start duckdns