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NSTX (the Nameserver Transfer Protocol) is a implementation of a DNS tunnel written in C and available as open source.

There exists only one version from September 2002.

Other (newer) implementations of a DNS Tunnel include OzymanDNS, iodine, DNS2TCP, DaNeSh, DNScat and TUNS. PingTunnel/ptunnel is a ICMP tunnel which works similar.