It's weird, DNSdynamic is down since last week and I can't find any information about it anywhere!! Usually when a service like that dies, you find some sort of discussion topic somewhere or a news article (or a mention), but even now (a week later) still nothing!
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@captain_to_fire nah, it's a service you use if you need a static IP. It gives you a URL and it points towards the IP of your choosing, it often comes with a client that keeps the IP up-to-date when it changes. DNSdynamic.org just happens to be one that a friend was using for VPNing so he could have access to his stuff remotely.
https://en.wikipedia.org/wiki/Dynamic_DNS
I switched him to FreeDNS (https://freedns.afraid.org/)