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Netcat 1.10 is an updated release of Netcat, 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.

Some of netcat's major features are:

Outbound or inbound connections, TCP or UDP, to or from any ports
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 port-scanning capabilities, with randomizer
Built-in loose source-routing capability
Can read command line arguments from standard input
Slow-send mode, one line every N seconds
Hex dump of transmitted and received data
Optional ability to let another program service established connections
Optional telnet-options responder

A very short list of potential uses:

Script backends
Scanning ports and inventorying services, automated probes
Backup handlers
File transfers
Server testing, simulation, debugging, and hijacking
Firewall testing
Proxy gatewaying
Network performance testing
Address spoofing tests
Protecting X servers
1001 other uses you'll likely come up with

Changes between the 1.00 release and this release:

Better portability -- updated generic.h and Makefile [thanx folks!]
Indication of local-end interface address on inbound connections
That's *Dave* Borman's telnet, not Paul Borman...
Better indication of DNS errors
Total byte counts printed if -v -v is used
A bunch of front-end driver companion programs and scripts
Better handling of stdin arguments-plus-data
Hex-dump feature
Telnet responder
Program exec works inbound or outbound now

Netcat and the associated package is a product of Avian Research, and is freely available in full source form with no restrictions save an obligation to give credit where due. Get it via anonymous FTP at which is a gzipped tar file and not to be confused with its version 1.00 precursor, nc100.tgz. Other distribution formats can be accomodated upon request. Netcat is also mirrored at the following [faster] sites:

_H* 960320

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