Soooo....
I have set up the dynamic host service for us.
We have a fully automated dynamic IP domainname now!
-> hpcraft.de <-
My provider disconnects me every 24 hours to set a new IP for my connection.
The service is getting the new IP after a disconnect from my provider.
Then it's updating the nameserver and reloads the zone.
TTL (time to live) is on 5 minutes.
So it can take that time to have the IP updated at your providers nameserver.
Feel free to use hpcraft.de to connect to the server.
When it doesn't work, use the IP instead (which is still at the website).
Also www.hpcraft.de is linked to the website at www.hpminecraft.de.