Nmap scan report for 121.200.50.181
Host is up (0.25s latency).
Not shown: 93 closed tcp ports (reset)
PORT     STATE    SERVICE
22/tcp   filtered ssh
80/tcp   filtered http
139/tcp  filtered netbios-ssn
443/tcp  open     https
445/tcp  filtered microsoft-ds
1720/tcp filtered h323q931
5060/tcp filtered sip

Nmap done: 1 IP address (1 host up) scanned in 5.59 seconds