It all started as a small project for personal purposes.
A few years ago, a major provider of dynamic DNS services closed free accounts for using their hosts. While I usually like to pay for useful things, I refused to do so for that service because the pricing was way too much for something like that. So I spent a few nights and drinks to write the first version of YDNS which provided basic dynamic DNS hosting and it turned out to work pretty well.
The project grew and we integrated it into our coporate to provide some commercial and financial background for it.
YDNS is powered by open source software.