How to scan for open ports?

To scan for open ports on a target machine, you can use Nmap. Here are some basic commands:

1. Scan the most common 1000 ports on localhost:

   nmap localhost

2. Scan all 65535 ports:

   nmap -p- localhost

3. Scan a specific range of ports (e.g., ports 1 to 1000):

   nmap -p 1-1000 localhost

4. Scan a specific IP address:
   Replace <YOUR_IP> with the target IP address.

   nmap <YOUR_IP>

These commands will provide you with a list of open, closed, and filtered ports along with the services running on those ports.