21 – FTP — File Transfer Protocol ;
22 – SSH — Secure Shell ;
23 – Telnet
25 – SMTP — Simple Mail Transfer Protocol ;
53 – DNS — Domain Name System
80 – HTTP — Hypertext Transfer Protocol ;
110 – POP3 — Post Office Protocol 3 ;
143 – IMAP — Internet Message Access Protocol ;
443 – HTTPS — Secure Hypertext Transfer Protocol ;
3389 – RDP — Remote Desktop Protocol ;
137-139 – NetBIOS/NetBT — Network Basic Input Output System
445 – SMB — Server Message Block
548 – AFP — Apple Filing Protocol ;
67/68 – DHCP — Dynamic Host Configuration Protocol ;
389 – LDAP — Lightweight Directory Access Protocol ;
161 – SNMP — Simple Network Management Protocol ;
used to transfer files to and from a server
used to access remote devices with added encryption
used to access remote devices with no encryption
used for sending email ; port 587 is secure
translates domain names to IP addresses
standard for communication on the web, used to render pages in web browsers
used for receiving email ; port 995 is secure
used for receiving email; port 993 is secure
secured communication on the web
used to connect to remote computers
allows applications on different computers to communicate within a local area network (LAN)
provides shared access to files, printers, and serial ports on a network.
used for Apple file services
used to assign IP addresses to network hosts
used to access a directory on network objects
used to send and receive network management messages