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(Dynamic DNS) A service that lets anyone on the Internet gain access to resources on a local network when the Internet address of that network is constantly changing. Such resources are typically a Web server, Webcam or a PC for remote control operation.

Cable and DSL providers frequently change the IP address of their customer's service, which makes it impossible to access the network from the outside world without knowing what the IP address is at any given moment. DDNS client software resides in a router, Webcam or PC. When it detects that the IP address of the cable or DSL modem has changed, it notifies the DDNS service provider of the new address. See dynamic IP address.

The DDNS Service Provider
The key element in this is the DDNS service provider, which hosts the DNS servers that become the authority for the domain names. When the DNS server responds to a request for the IP address of a domain name, it returns the current address along with a time-to-live (TTL) of only a few minutes. By causing the address to expire in such a short time, it prevents the address from being cached throughout the Internet. See TTL.

The DDNS provider generally offers a faster and more economical way to gain external access to internal resources than by upgrading ISP service from dynamic addressing to a static address. The largest DDNS provider is Dynamic Network Services, which acquired DDNS company Tzolkin Corporation in 2012 (www.dyn.com). See DDNS relay, DHCP, WINS and DNS.

Comes With the Product
For residential users of Foscam's IP network cameras, the company offers its own DDNS service to allow remote access to the camera. As in this example, a DDNS URL is assigned to a new user in case the Internet provider changes the IP address.
References in periodicals archive ?
From Dynamic DNS to Managed DNS and other integral domain products, No-IP delivers trusted products that help people stay connected to their devices and ensures that the domain and related services are fast, safe and always available.
The TZO Dynamic DNS Service allows small businesses and home offices to reduce their expenses by hosting their own Web sites, e-mail servers, FTP servers and more without having to purchase a static IP address or pay a hosting service.
The Pepperell, Massachusetts, based company provides proprietary DNS software and diverse vendors throughout DNS and email networks, in addition to strong dynamic DNS partnerships and a history of innovation.
issuing DNS queries for Dynamic DNS domains, which showed evidence of networks
Thomas Hoops, CTO for Highly Reliable Systems says "simple port forwarding is used to allow NetSwap to see each other over the Internet and low cost dynamic DNS services are supported so that no static IP addresses are required.
11b/g Wi-Fi, built-in 4-port 10/100M bps switch, stateful Packet Inspection firewall, built-in dynamic DNS client, protection against Denial of Service (Dos) attacks and Internet access control tools providing client and site filtering.
Dynamic DNS support to eliminate the use of WINS or LMHOSTS files to log into one NT Domain or to browse the network.
When we first started as a free Dynamic DNS provider (originally DynDNS.
First to embed Dynamic DNS capabilities in SME routers in 1998, first to productize AutoMatic DNS Failover in 2000 and first to deliver GEOgraphically aware DNS as a service in 2008.
Because DNS services are the "first stop" for every mobile Internet connection--translating a user's request for a website to the required IP address--CSPs need a stable, intelligent, scalable, and dynamic DNS infrastructure.
Optional voice and fax services include, Dynamic DNS, to-mobile calling, instant messaging and specialized telex and graphical fax gateways.
a world leader in managed DNS and email delivery, announces that they have furthered their partnership with long time client, D-Link, by including a built in dynamic DNS update client in select home networking routers that will automatically update and support the use of IPv6 addresses for dynamic DNS hostnames.

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