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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 is the “classic” netcat, written by Hobbit. It lacks many features found in netcat-openbsd.

Installed size: 138 KB
How to install: sudo apt install netcat-traditional

  • libc6

TCP/IP swiss army knife

root@kali:~# nc.traditional -h
connect to somewhere:	nc [-options] hostname port[s] [ports] ... 
listen for inbound:	nc -l -p port [-options] [hostname] [port]
	-c shell commands	as `-e'; use /bin/sh to exec [dangerous!!]
	-e filename		program to exec after connect [dangerous!!]
	-b			allow broadcasts
	-g gateway		source-routing hop point[s], up to 8
	-G num			source-routing pointer: 4, 8, 12, ...
	-h			this cruft
	-i secs			delay interval for lines sent, ports scanned
        -k                      set keepalive option on socket
	-l			listen mode, for inbound connects
	-n			numeric-only IP addresses, no DNS
	-o file			hex dump of traffic
	-p port			local port number
	-r			randomize local and remote ports
	-q secs			quit after EOF on stdin and delay of secs
	-s addr			local source address
	-T tos			set Type Of Service
	-t			answer TELNET negotiation
	-u			UDP mode
	-v			verbose [use twice to be more verbose]
	-w secs			timeout for connects and final net reads
	-C			Send CRLF as line-ending
	-z			zero-I/O mode [used for scanning]
port numbers can be individual or ranges: lo-hi [inclusive];
hyphens in port names must be backslash escaped (e.g. 'ftp\-data').

Updated on: 2024-Feb-16