Well, if you use DDNS I assume you have some kind of server behind that. I just self host a godns container. No need for any service except an DNS API. I use cloudflare. But my IP only changes rarely, so I can't tell you how fast that setup propegates
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For my server I bought a domain on loopia.se and pay for no other features than the domain name. On the Loopia website I then changed the DNS nameserver to Cloudflare and use a script to update the IP of my network. Cloudflare has some package you can install on Linux to update the IP but I never tried it.
On the off chance you’re facing issues due to CGNAT, you’d likely need to work around it with something like a cloudflare tunnel, or purchasing a cheap VPS and porting all traffic through WireGuard or similar.
cloudns.net
I’ve used duckDNS for years. A couple of years ago it started flaking out every couple of months so I migrated off it.
Another free option I like is dynu.com
They have an example ddclient config in their FAQ: https://www.dynu.com/FAQ/Dynamic-DNS-Service#IPUpdate
For dynamic updating of dns, don't use ddclient or cron scripts on the server. Instead use inadyn.
Ddclient is more or less just dead/maintenance mode.
also using cron scripts kinda sucks and is ugly.
just use inadyn and spare yourself headache.
You'd basically just add something like this to the inadyn.conf file
provider duckdns.org {
username = YOUR_TOKEN
password = noPasswordForDuckdns
hostname = YOUR_DOMAIN.duckdns.org
}