List of mostly used default ports on the CentOS servers Port Number - Name 20 - FTP 21 - FTP 22 - SSH 25 - SMTP/EMAIL 26 - SMTP 43 - WHOIS (We don't recommend opening this port) 53 - BIND/DNS 80 - HTTP / Apache Web server 110 - POP3/EMAIL 143 - IMAP 443 […]
