netcat

Usage⚑

Test TCP connections⚑

nc -v -z -w 3  

Options: * -v: verbose * -z: just check if the port is open and exit (without sending any data) * -w 3: 3 seconds timeout

If it exists with return code 0, it means that the connection succeeded.

Listen to a port⚑

netcat -l

Scan port range⚑

nc -zvnw 1 1-1000

• -z Port scanning mode.
• -v Verbose.
• -n Do not resolve the host name.
• -w 1 1s timeout.

(https://www.cyberciti.biz/faq/linux-port-scanning/)

Connect through TOR⚑

nc -v -X5 -x localhost:9050  

• (http://vicendominguez.blogspot.com/2014/08/using-nc-and-ncat-with-tor-without.html)

Reference⚑

Basic usage⚑

• (https://www.digitalocean.com/community/tutorials/how-to-use-netcat-to-establish-and-test-tcp-and-udp-connections-on-a-vps)