Find all open ports using nmap

To find all open ports on a computer, run

-sS = SYN scan

if you only need to scan most common ports, use


nmap list ports

To see open ports on your local computer, run

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

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