Port scanning

Scan ports 20-80 on a host (zero I/O mode)

nc -zv 192.168.1.1 20-80

More netcat commands

Transfer file (sender)

nc -lvp 4444 < file.tar.gz

Send file to a remote listener
Transfer file (receiver)

nc 192.168.1.1 4444 > file.tar.gz

Receive a file from a netcat sender
UDP mode

nc -u 192.168.1.1 5005

Connect using UDP instead of TCP
Simple HTTP request

echo -e "GET / HTTP/1.0 " | nc example.com 80

Send a raw HTTP GET request with netcat
Reverse shell (attacker listener)

nc -lvp 4444

Wait for an incoming reverse shell connection