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This is a piece of software that lets you tunnel IPv4 data through a DNS server. This can be usable in different situations where Internet access is firewalled, but DNS queries are allowed.

wdns is a low-level DNS library. It contains a fast DNS message parser and various utility functions for manipulating wire-format DNS data.

Portably control DNS clouds using java or bash

ddclient is a Perl client used to update dynamic DNS entries for accounts on many dynamic DNS services.

Dnsruby is a pure Ruby DNS client library. It provides a complete DNS client implementation, including full DNSSEC support.

fpdns - Fingerprinting DNS servers A nameserver basically responds to a query. Interoperability is an obvious requirement here. The standard protocol behaviour of different DNS implementations is expected to be the same. Requirements for protocol behaviour of DNS implementations is widely documented in the case of 'common' dns messages. The DNS protocol is over 20 years old and since its inception, there have been over 40 independent DNS implementations, while some implementations have over 20 versions. The methodology used to identify individual nameserver implementations is based on "borderline" protocol behaviour. The DNS protocol offers a multitude of message bits, response types, opcodes, classes, query types and label types in a fashion that makes some mutually exclusive while some are not used in a query messages at all. Not every implementation offers the full set of features the DNS protocol set currently has. Some implementations offer features outside the protocol set, and there are implementations that do not conform to standards.

getdns is a modern asynchronous DNS API. It implements DNS entry points from a design developed and vetted by application developers, in an API specification edited by Paul Hoffman. With the development of this API, we intend to offer application developers a modernized and flexible way to access DNS security (DNSSEC) and other powerful new DNS features; a particular hope is to inspire application developers towards innovative security solutions in their applications.

DNRD is a proxy DNS daemon. It supports several forward servers for redundancy and/or load-balancing. DNS queries for specific domains can be forwarded to a specific group of DNS servers (with redundancy and load balancing) for that domain. It is useful for VPNs and also good support for offline and dialup sites.

INADYN is a free, multi-platform dynamic DNS update client. It gives the possibility to have your own fixed hostname registered on the Internet, although your IP might be changing. It checks periodically whether the IP address stored by the DNS server is the real current IP address of the machine that is running INADYN. INADYN supports the following dynamic DNS services: - dyndns.org (in all three flavors: dynamic, static, custom) - freedns.afraid.org - no-ip.com - zoneedit.com

dnspython is a DNS toolkit for Python. It supports almost all record types. It can be used for queries, zone transfers, and dynamic updates. It supports TSIG authenticated messages and EDNS0. dnspython provides both high and low level access to DNS. The high level classes perform queries for data of a given name, type, and class, and return an answer set. The low level classes allow direct manipulation of DNS zones, messages, names, and records.