TCP-IP Ports and Protocols

 

Application Protocol

Function

Port Number

HTTP

Web Pages

80

HTTPS

Secure Web Pages

443

FTP

File Transfer Protocol

20, 21

SFTP

Secure File Transfer Protocol

22

TFTP

Trivial File Transfer Protocol

69

IMAP

Email Incoming

143

POP3

Email Incoming

110

SMTP

Simple Mail Transfer Protocol 

Email Outgoing

25

Telnet

Terminal Emulation

23

SSH

Encrypted Terminal Emulation

22

RDP

Remote Desktop Protocol

3389

SIP

Voice Over IP

5060


Utility Protocol

Function

Port Number

Protocol

DNS

Domain Name Service - allow use

53

UDP (User Datagram Protocol)

DHCP

Dynamic Host Control Protocol - Dynamic (Auto) IP Addressing

67, 68

UDP

LDAP

Lightweight Directory Access Protocol 

Directory Query

389

TCP

SNMP

Network Devices Remote Management;

Simple Network Mgmt Protocol

161, 162 

UDP

SMB 

CIFS (Common Internet File System); Windows Share Folder

445

137, 138, 139

TCP

UDP

AFP

MacOS File Service

548

TCP

SLP

Services Discovery Protocol

427

TCP / UDP

NetBIOS / NetBT

NetBIOS over TCP/IP

137, 139

137, 138

TCP

UDP

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