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20,21

FTP, File Transfer Protocol

22

SSH, Secure Shell

23

Telnet, Remote Terminal Emulation

25

SMTP, Simple Mail Transfer Protocol

50,51

IPSec, Internet Protocol Security

53

DNS, Domain Name Server

67,68

DHCP, Dynamic Host Configuration Protocol

69

TFTP, Trivial File Transfer Protocol

80

HTTP, HyperText Transfer Protocol

110

POP3, Post Office Protocol

119

NNTP, Network News Transfer Protocol

123

NTP, Network Time Protocol

135-139

NetBIOS

143

IMAP4, Internet Message Access Protocol

161

SNMP, Simple Network Management Protocol

389

LDAP, Lightweight Directory Access Protocol

443

HTTPS, HyperText Transfer Protocol with Secure Sockets Layer (SSL)

Well Known Ports

Assigned for specific Protocols and Services, Ports 0 to 1,023

Registered Ports

ICANN can assign a specific port for a newly created network service, Ports 1,024 to 49,151

Dynamic (Private or High) Ports

Ports 49,152 to 65,535

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