Would really be nice to let users enter a custom url, with place holders. So you could enter the following to update Namecheap for example:
https://dynamicdns.park-your-domain.com/update?by=nc&host=*&domain=fark.com&password=wewerwr&ip={ip}
And {ip} would be populated with the new IP. Using this approach you could pretty much support any DDNS service out there. The current “custom” option still uses the DynDns protocol, so not really custom. Maybe that option could be called “DynDns Compatible” and a new option called “Custom” where you can enter a custom url with place holders?
And, I know that you already support DNS-O-MATIC but would be nice not to have to set up yet another account/service.