Www uses HTTP protocol (hypertext transfer protocol), port number is 80 DNS (TCP/IP protocol), port number is 53MAIL, SMTP protocol, POP3 protocol, IMAP4 protocol (one of TCP/IP protocols), port number is 25 \1/kloc-0 FTP (file transfer protocol) and port number is 2/kloc-0.

TELNET applies Telnet protocol (a TCP/IP protocol), and the port number is 23.

The above is my original answer, please forgive me for my mistakes!