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A pure java DNS client implementation. Consists of a library and utilities for looking up the Internet domain names. The utilities are also able to fetch an entire domain zone and save it in the standard DNS zone file format.
DioNiSio is a DNS scanner written in ANSI C that only depends on sockets library and libc. It implements 3 scan methods (dictionary, massive reverse lookup and recursive zone transfers). Targeted to portability, rational resources usage, and easy use.
DDNSNotify logs into a (telnet-enabled) router and retrieves the WAN IP Address, only IF the IP Address differs from the DNS IP address for the domain name. It's useful to update DNS records using another external DDNS script (such as zoneclient.py).
The Dynamic DNS project aims to provide a free and open dynamic dns server and a suite of multi-language api tools for integrating dynamic dns services into applications.