DirectUpdate is an application that runs transparently in background (as a service, even when no user is logged), and check the IP address assigned to the machine.
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DynDNS Simply Client AlternativesDynamic DNS Services and other similar apps like DynDNS Simply Client
DynDNS Simply Client is described as 'Computer application (for DynDNS users) that keeps your hostname's IP address up-to-date. The DynDNS Simply Client periodically checks your network's IP address and it sends (updates) the new IP address to your hostname in your' and is a Dynamic DNS service. There are three alternatives to DynDNS Simply Client for Mac, Windows and Web-based. The best DynDNS Simply Client alternative is DirectUpdate. It's not free, so if you're looking for a free alternative, you could try Dynamix.
Alternatives list
9 Dynamix alternativesFree and simple IPv4 & IPv6 dynamic DNS for personal use. Register your own subdomains (for free) or use your own custom domains (you must own the domain name). Free subdomain registration.
RealDNS is an application that updates your hostnames with the latest IP address of your computer, to many dynamic DNS providers.
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