A+ 1102 port numbers

Well Known (Common) Ports

0-1023

FTP (File Transfer Protocol)

TCP/UDP 20(data) and TCP 21(control)

SSH (Secure Shell)

TCP/UDP 22

Telnet (Telecommunication Network)

TCP/UDP 23

SMTP (Simple Mail Transfer Protocol)

TCP 25

DNS (Domain Name System)

TCP/UDP 53

DHCP (Dynamic Host Configuration Protocol)

UDP 67(IPv4 client) and UDP 68(IPv4 server);

HTTP (Hypertext Transfer Protocol)

TCP 80

POP3 (Post Office Protocol version 3)

TCP 110

NetBios/NetBT

UDP/TCP 137

IMAP4 (Internet Message Access Protocol, version 4)

TCP 143

SNMP (Simple Network Management Protocol)

UDP 161

HTTPS (Hypertext Transfer Protocol Secure)

TCP 443

RDP (Remote Desktop Protocol)

3389

SMB (Server Message Block)

445

SLP (Service Location Protocol)

427

AFP (Apple Filing Protocol)

548

LDAP (Lightweight Directory Access Protocol)

389 (Authentication)

SNMP (Simple Network Management Protocol)

161

IMAP4 (encrypted)

993

SMTP (Simple Mail Transfer Protocol) encrypted

587

POP3 (Post Office Protocol version 3) encrypted

110