TCP - 20 (Data)

TCP - 21 (Control

FTP port

TCP - 23

Telnet port

TCP - 22

SSH port

TCP - 25

SMPT port

TCP - 53 (zone transfers)

UDP - 52 (queries)

DNS port

UDP - 67,68

DHCP/BOOTP port

TCP - 80

HTTP port

TCP - 110

POP3 port

TCP - 143

IMAP4 port

UDP - 161, 162

SNMP port

TCP - 443

HTTPS port
(HTTP over SSL)

TCP - 3389

RDP port

TCP - 389

LDAP port

TCP - 3020

SMB/CIFS port

Common Internet File System

provides shared access to files, printers, etc

CIFS

File Transfer Protocol

FTP

Simple Mail Transfer Protocol

SMTP

Domain Name Service

DNS

Hypertext Transfer Protocol

HTTP

Post Office Protocol version 3

POP3

Internet Message Access Protocol

IMAP

Hypertext Transfer Protocol Secure

HTTPS

Remote Desktop Protocol

RDP

Dynamic Host Configuration Protocol

Automatic assignment of IP addresses

DHCP

Lightweight Directory Access Protocol

LDAP

Simple Network Management Protocol

for managing devices across a network

SNMP

Server Message Block

file and printer sharing for Windows

SMB

Secure Shell

a terminal session that is encrypted

SSH

Secure FTP over SSH

file transfer that is encrypted

SFTP

File Transfer Protocol

file transfer - UNencrypted

FTP