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This, however, broke the end-to-end principle of Internet architecture and methods were required to allow private networks, with frequently changing external IP addresses, to discover their public address and insert it into the Domain Name System in order to participate in Internet communications properly.

Today, numerous providers, called Dynamic DNS service providers, offer such technology and services on the Internet.

The first is "standards-based DNS updates", which uses an extension of the DNS protocol to ask for an update; this is often used for company laptops to register their address.

The second is usually a web-based protocol, normally a single HTTP fetch with username and password which then updates some DNS records (by some unspecified method); this is commonly used for a domestic computer to register itself by a publicly-known name in order to be found by a wider group, for example as a games server or webcam.

DHCP became an important tool for ISPs as well to manage their address spaces for connecting home and small-business end-users with a single IP address each by implementing network address translation (NAT) at the customer-premises router.

The private network behind these routers uses address space set aside for these purposes (RFC 1918), masqueraded by the NAT device.

The first implementations of dynamic DNS fulfilled this purpose: Host computers gained the feature to notify their respective DNS server of the address they had received from a DHCP server or through self-configuration.

The Dynamic Host Configuration Protocol (DHCP) allowed enterprises and Internet service providers (ISPs) to assign addresses to computers automatically as they powered up.

In addition, this helped conserve the address space available, since not all devices might be actively used at all times and addresses could be assigned as needed.

Dynamic DNS is a system that addresses the problem of rapid updates.

The term is used in two ways, which, while technically similar, have very different purposes and user populations.