Internal Program Version: netcat-openbsd  1.229

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, since it can create almost any kind of
connection you would need and has several interesting built-in
capabilities.

This package contains the OpenBSD rewrite of netcat, including support
for IPv6, proxies, and Unix sockets.

http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/nc