DynDNS setup guide

Set up DynDNS on your FRITZ!Box

Reach your home network under a fixed hostname — your FRITZ!Box reports every IP change automatically.

AVM’s FRITZ!OS has a built-in DynDNS client that works perfectly with dremaxx: choose the “Custom” provider, paste the update URL and your FRITZ!Box keeps your hostname up to date over IPv4 and IPv6.

Before you start: get your DynDNS credentials

Every DynDNS domain comes with its own username (the hostname itself) and a generated router password. You find both in the dremaxx console:

  1. Sign up for free and create a DynDNS domain — e.g. myhome.dxdns.de under a shared system domain, or under your own domain.
  2. Open the domain in the console — the “Router credentials” card shows username, password and the update URL.
  3. Enter those values below in place of the example hostname.
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Settings

Values to enter

FRITZ!Box UI: Internet › Permit Access › DynDNS › enable “Use DynDNS”, provider “Custom”.

Update URLhttps://www.dremaxx.de/api/dyn-dns/nic/update?hostname=<domain>&myip=<ipaddr>&myip6=<ip6addr>
Domain namemyhome.dxdns.de
Usernamemyhome.dxdns.de
Password:The router password of your domain (from the console)

myhome.dxdns.de is an example — replace it with your own DynDNS domain from the console.

Step by step

Set it up

1
Open the DynDNS settings

Log in to your FRITZ!Box at fritz.box, then go to Internet › Permit Access › DynDNS and tick “Use DynDNS”.

2
Choose the custom provider

Select “Custom” (user-defined) as the DynDNS provider so you can enter your own update URL.

3
Enter the update URL

Paste the update URL exactly as shown above — the <domain>, <ipaddr> and <ip6addr> placeholders are filled in by the FRITZ!Box on every update.

4
Enter domain name, username and password

Domain name and username are both your full DynDNS hostname; the password is the router password from the console.

5
Apply and wait for the first update

Click “Apply”. The FRITZ!Box sends its first update right away — check the update history in the dremaxx console.

Dual stack

IPv6 / dual-stack notes

IPv6 is sent via the <ip6addr> placeholder in the update URL. Make sure IPv6 is active on your connection — without it the placeholder stays empty and only the A record is updated.
Check

Verify it works

After saving, your device sends its first update within seconds to a few minutes. Open the domain in the dremaxx console — the update history shows every request live, including the reported IPv4/IPv6 and its status. Alternatively, resolve your hostname (e.g. with our DNS lookup tool or dig) and compare it with your current public IP.

Note: one update per minute and address family is accepted per hostname. Identical re-announcements are answered with “nochg” — that is normal and not an error.

Ready to reach home from anywhere?

Create your first DynDNS hostname in minutes — free — and let your router do the rest.

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