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Vote for DDNSServ
DDNSServ allows you to run your own DDNS service. The server suite supports MX, CNAME and NS records. With DDNSServ, you can offer the internet community a valid alternative to static IP addressing. This allows you to provide Dynamic DNS services, which enables people who use your DDNS service to do just about anything they could do with a static IP address. Those people can also run their own DNS server, despite changing IP's. Server component requires Windows 2000 Server or 2003 Server.