What is Netcat?

Netcat is a networking utility which reads and writes data across network connections. Necat use the TCP/IP protocol for operations. It is reliable "back-end" tool. This utility can be used directly or easily by other programs and scripts. Netcat is a feature-rich network debugging and exploration tool. Netcat create any kind of connection that needed and has several interesting built-in capabilities.

Features:

• TCP or UDP Outbound and inbound connections
• Tunneling mode 
• Built-in port-scanning capabilities
• Full DNS forward/reverse checking, with appropriate warnings
• Ability to use any local source port
• Ability to use any locally configured network source address
• Built-in loose source-routing capability
• Can read command line arguments from standard input
• Buffered send-mode (one line every N seconds)
• Hexdump (to stderr or to a specified file) of trasmitted and received data.
• Optional RFC854 telnet codes parser and responder.

The GNU Netcat is distributed freely under the GNU General Public License (GPL).