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Many providers offer commercial or free Dynamic DNS service for this scenario.
The automatic reconfiguration is generally implemented in the user's router or computer, which runs software to update the DDNS service.
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.
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.
The Domain Name System brought a method of distributing the same address information automatically online through recursive queries to remote databases configured for each network, or domain.
Even this DNS facility still used static lookup tables at each participating node.
Dynamic DNS (DDNS) is a method of automatically updating a name server in the Domain Name Server (DNS), often in real time, with the active DDNS configuration of its configured hostnames, addresses or other information.