Set up DynDNS

If you run a server at home, your provider usually does not hand out a fixed IP address. With dynamic DNS the device submits the new address itself as soon as it changes — so the domain keeps pointing at the right connection.

Turning it on

Domains → your domain → DynDNS, direct address: dash.regfish.de/my/domains/<tld>/<sld>/dyndns

Set the Enable DynDNS switch and confirm with Apply. The page then shows the DynDNS token it generated. Enter that token in your router as the username — it replaces username and password in one.

Whether DynDNS is on for a domain is also shown by the DynDNS tile on the domain overview.

Caution

The token is an access key for exactly this domain. Anyone who has it can rewrite the address your domain points to. Treat it like a password.

Entering it in the router

The update URL differs depending on whether you want IPv4, IPv6, or both to be maintained. For the FRITZ!Box, the full procedure with all three variants has a recipe of its own:

Set up regfish DynDNS on an AVM FRITZ!Box

The same pattern applies to other devices: enter the update URL, set the token as the username, specify the domain.

Doing it with your own script

Instead of a router, a script can just as well keep the address up to date — useful on a server that is running anyway, or when several names need updating at the same time. The DynDNS via IP comparison recipe walks through it: determine the current address, compare it with the record, write only when they differ.

The matching endpoint is PATCH /dns/rr.