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Dynamic IP addresses present a problem if the customer wants to provide a service to other users on the Internet, such as a web service.As the IP address may change frequently, corresponding domain names must be quickly re-mapped in the DNS, to maintain accessibility using a well-known URL.The second kind of dynamic DNS permits lightweight and immediate updates often using an update client, which do not use the RFC2136 standard for updating DNS records.These clients provide a persistent addressing method for devices that change their location, configuration or IP address frequently.Dynamic DNS is a system that addresses the problem of rapid updates.
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.DNS is based on a distributed database that takes some time to update globally.When DNS was first introduced, the database was small and could be easily maintained by hand.End users of Internet access receive an allocation of IP addresses, often only a single address, by their Internet service provider. static), or may change from time to time, a situation called dynamic.Dynamic addresses are generally given only to residential customers and small businesses, as most enterprises specifically require static addresses.
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.