Starting Nmap 7.80 ( https://nmap.org ) at 2020-04-20 16:04 PDT Nmap scan report for wh.iov.cn (159.226.251.13) Host is up (0.18s latency). rDNS record for 159.226.251.13: mail.cstnet.cn Not shown: 92 filtered ports PORT STATE SERVICE 25/tcp open smtp 80/tcp open http 110/tcp open pop3 143/tcp open imap 443/tcp open https 465/tcp open smtps 993/tcp open imaps 995/tcp open pop3s Nmap done: 1 IP address (1 host up) scanned in 10.35 seconds