netcat6 | TCP/IP swiss army knife with IPv6 support | Mehr ...
A simple Unix utility which reads and writes data across network connections using TCP or UDP protocol. It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time it is a feature-rich network debugging and exploration tool. . Netcat6 is a rewrite of the original netcat with support for IPv6 and an enhanced support for UDP.