• TCP 20 and 21 (File Transfer Protocol, FTP)
• TCP 22 (Secure Shell, SSH)
• TCP 23 (Telnet)
• TCP 25 (Simple Mail Transfer Protocol, SMTP)
• TCP and UDP 53 (Domain Name System, DNS)
• UDP 69 (Trivial File Transfer Protocol, tftp)
• TCP 79 (finger)
• TCP 80 (Hypertext Transfer Protocol, HTTP)
• TCP 110 (Post Office Protocol v3, POP3)
• TCP 119 (Network News Protocol, NNTP)
• UDP 161 and 162 (Simple Network Management Protocol, SNMP)
• UDP 443 (Secure Sockets Layer over HTTP, https)

source: https://www.garykessler.net/library/is_tools_scan.html

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