![]() For example, to scan for open ports in the range 20-80 you would use the following command: nc -z -v 10.10.8.8 20-80 The -z option will tell nc to only scan for open ports, without sending any data to them and the -v option to provide more verbose information. You can scan a single port or a port range. If you would like to establish a UDP connection, use the -u option: nc -u host port Copy Port Scanning Scanning ports is one of the most common uses for Netcat. ![]() By default, Netcat will attempt to start a TCP connection to the specified host and port. They are both symlinks to the openBSD version of Netcat. Netcat Syntax The most basic syntax of the Netcat utility takes the following form: nc host port Copy On Ubuntu, you can use either netcat or nc. The Netcat package is pre-installed on macOS and popular Linux distributions like Ubuntu, Debian or CentOS. You can use Netcat to debug and monitor network connections, scan for open ports, transfer data, as a proxy, and more. Netcat is cross-platform, and it is available for Linux, macOS, Windows, and BSD. It is one of the most powerful tools in the network and system administrators arsenal, and it as considered as a Swiss army knife of networking tools. ![]() Netcat (or nc) is a command-line utility that reads and writes data across network connections, using the TCP or UDP protocols.
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