What is dynamic DNS and why might a website use it?¶

Dynamic DNS keeps a hostname pointed at a connection whose public IP address may change.

How the update works¶

A router, device or software client checks the current public address and reports it to the dynamic-DNS provider. The provider changes the DNS record so users can continue reaching the same hostname.

It is like telling a forwarding service each time a mobile business moves: customers use the stable business name while the delivery address is updated behind it.

This is common with home connections, small offices, remote-access systems and self-hosted services. The hostname may be supplied directly by the dynamic-DNS company or used beneath a separately registered domain.

Provider records may include account details, hostname creation, update history, source IP addresses, logins and payments. Historic update data can be especially useful because it may show which public address was linked to the hostname during the relevant event.

An update proves that a device or credential reported an address; it does not automatically identify the operator. Credentials can be shared or stolen, and a compromised router may continue submitting updates. The hostname may also point to a tunnel or intermediary rather than directly to the server.