FTP port

TCP - 20 (Data)

TCP - 21 (Control

Telnet port

TCP - 23

SSH port

TCP - 22

SMPT port

TCP - 25

DNS port

TCP - 53 (zone transfers)

UDP - 52 (queries)

DHCP/BOOTP port

UDP - 67,68

HTTP port

TCP - 80

POP3 port

TCP - 110

IMAP4 port

TCP - 143

SNMP port

UDP - 161, 162

HTTPS port
(HTTP over SSL)

TCP - 443

RDP port

TCP - 3389

LDAP port

TCP - 389

SMB/CIFS port

TCP - 3020

CIFS

Common Internet File System

provides shared access to files, printers, etc

FTP

File Transfer Protocol

SMTP

Simple Mail Transfer Protocol

DNS

Domain Name Service

HTTP

Hypertext Transfer Protocol

POP3

Post Office Protocol version 3

IMAP

Internet Message Access Protocol

HTTPS

Hypertext Transfer Protocol Secure

RDP

Remote Desktop Protocol

DHCP

Dynamic Host Configuration Protocol

Automatic assignment of IP addresses

LDAP

Lightweight Directory Access Protocol

SNMP

Simple Network Management Protocol

for managing devices across a network

SMB

Server Message Block

file and printer sharing for Windows

SSH

Secure Shell

a terminal session that is encrypted

SFTP

Secure FTP over SSH

file transfer that is encrypted

FTP

File Transfer Protocol

file transfer - UNencrypted