Dynamic DNS or DDNS is a method of updating, in real time, a DNS to point to a changing IP address on the Internet.

This is used to provide a persistent domain name for a resource lacking a static IP.

Domain confirmation is not required for Enhanced users though. Remember that if the service allows you to update your IP using the command line, you can automate the process using tools such as cron or systemd/Timers. Free provides free A and AAAA DNS records and CNAME, TXT and MX records with a premium membership.

The update client runs in the background, so once you have it properly configured you don’t have to worry about it; you only need to remember your hostname to reach your files and services.

You can either use the update client in your router or download a software client to run on your computer.

The update client periodically checks your network’s IP address; if it sees that your IP address has changed, it sends (updates) the new IP address to your hostname in your Dyn account.

If you’re like many Dyn DNS customers, you have a dynamic IP address which changes periodically (monthly, weekly or even daily).

This is a great utility for remotely connecting to your machine or running your very own Web or email server.

Save money by not paying your ISP for a static IP address.

No-IP Dynamic DNS Update Client (DUC) Sits in the background and monitors your current WAN IP address and updates the DNS associated with your No-IP account when your IP address changes.

Update multiple hosts asscociated with your account.

To use DDNS, you need to both sign up with a DDNS provider and set up an automatic update tool that will notify the provider when your IP address changes.