Simple HTTP request

Send a raw HTTP GET request with netcat

echo -e "GET / HTTP/1.0

" | nc example.com 80

More netcat commands

Reverse shell (attacker listener)

nc -lvp 4444

Wait for an incoming reverse shell connection
Banner grabbing

nc -v 192.168.1.1 22

Connect to port and read service banner
Timeout on connect

nc -w 3 192.168.1.1 80

Set connection timeout to 3 seconds
Listen on port

nc -lvp 4444

Start a netcat listener on port 4444
Connect to host

nc 192.168.1.1 80

Open a TCP connection to host on port 80