Find all open ports using nmap
To find all open ports on a computer, run
nmap -P0 -vv -sS -ff -r -n -p 1-65535 IP_ADDR_HERE
-sS = SYN scan
if you only need to scan most common ports, use
nmap IP_ADDR_HERE
Example
To see open ports on your local computer, run
nmap localhost
nmap -p 22 IP_ADDR | Scan a single port |
nmap -p 1-100 IP_ADDR | Scan range of ports |
nmap -p- IP_ADDR | Scan all 65535 ports |
nmap -F IP_ADDR | Scan most popular 100 ports (fast scan) |
See nmap