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An update client is a computer application or a feature in your router that keeps your hostname's IP address up-to-date. 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 DynDNS.com account.

If you're like most DynDNS.com customers, you have a dynamic IP address which changes periodically (monthly, weekly or even daily). This can make it difficult or impossible to connect to services at home, like remote desktop or FTP.

Using an update client with your Dynamic DNS or Custom DNS hostname allows you to make sure you can always reach your home network, because it makes sure that your hostname is always up-to-date with the latest IP address. 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.