nc 명령어 (포트 체크)

nc 명령으로 포트가 열렸는지 빠르게 (예시에서는 0.01 초) 확인이 가능하다.

root@sysdocu:~# nc -z -v 192.168.10.2 21

Ncat: Version 7.50 ( https://nmap.org/ncat )

Ncat: Connected to 115.68.221.85:21.

Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

root@sysdocu:~# nc -z -v 192.168.10.2 22

Ncat: Version 7.50 ( https://nmap.org/ncat )

Ncat: Connection refused.