8/9/22, 5:52 PM
Chapter 2: Internet Application Protocols
Application Protocols
Application Protocol
Function
Port Number
HTTP
Web pages
80
HTTPS
Secure Web pages
443
FTP
File transfer
20, 21
SFTP
Secure file transfer
22
IMAP
Incoming email
143
POP3
Incoming email
110
SMTP
Outgoing email
25
Telnet
Terminal emulation
23
SSH
Encrypted terminal emulation
22
RDP
Remote Desktop
3389
SIP
Voice over IP
5060
The below table does the same for utility protocols.
Utility Protocols
Utility Protocol
Function
TCP/UDP
Port Number
DNS
Allows the use of DNS
naming
UDP
53
DHCP
Automatic IP addressing
UDP
67, 68
LDAP
Querying directories
TCP
389
SNMP
Remote management of
network devices
UDP
161
TCP
445
UDP
137, 138, 139
SMB
Windows
(NetBIOS/NetBT)
naming/folder
sharing; also
CIFS
AFP
macOS file services
TCP
548
SLP
Services discovery protocol
TCP/UDP
427
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