Frequently asked questions

What is dynamic DNS?

Home internet connections usually get an IP address that changes now and then. Dynamic DNS keeps a hostname pointed at your current IP, so you can always reach your home even after the address changes.

Do I need a static IP?

No — that is exactly the problem KeepDNS solves. It is built for connections whose IP changes.

Does it work if I am behind CGNAT?

If your provider puts you behind CGNAT you have no public inbound IP, and dynamic DNS alone cannot make you reachable — that is a limitation of the connection, not of KeepDNS. You can check with your provider whether a public IP is available.

Which routers are supported?

Any router with a DynDNS/DDNS option that lets you set a custom provider — FRITZ!Box, ASUS, Synology, Ubiquiti, pfSense, OPNsense and more. You can also use ddclient or a simple cron job.

What does it cost?

KeepDNS is free for six months, then €2 per month. You can cancel anytime.

Can I use my own domain?

Yes. Point a CNAME from your domain at your KeepDNS hostname — see the "Use your own domain" guide.