Shutdown notice
Due to repeated abuse complaints and thus service disruptions I decided to not longer run this service.
Dealing with these cases takes a lot of time and requires immediate action. As hopper.pw was run as a spare time project I cannot guarantee this and do not have the time to constantly monitor and prevent abuse.
Where can I host my dynamic DNS now?
An alternative to hopper.pw is nsupdate.info it is also open source and non-commercial.
For more alternatives check Google™ or services like AlternativeTo