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Ports Reference

Port is address of the service within the System. So IP address + Port defines address of the particular service on the particular system. Port number is used to identify an application/services which you want to talk to on your system.

Some predefined ports like 80 = HTTP server, 23 = Telnet.


Total Number of ports: 65,535

Well-known ports: 0-1023

Registered ports: 1024-49,151

Dynamic ports: 49,152-65,535

Most common ports and services:

Protocol nameTCP/UDPPort number
File Transfer Protocol (FTP)TCP20, 21
Secure Shell (SSH)TCP22
TelnetTCP23
Simple Mail Transfer Protocol (SMTP)TCP25
Domain Name System (DNS)TCP/UDP53
Dynamic Host Configuration Protocol (DHCP)UDP67, 68
Trivial File Transfer Protocol (TFTP)UDP69
Hypertext Transfer Protocol (HTTP)TCP80
Post Office Protocol version 3 (POP3)TCP110
NetBIOSTCP/UDP137, 138, 139
Internet Message Access Protocol (IMAP)TCP143
Simple Network Management Protocol (SNMP)UDP161, 162
Lightweight Directory Access Protocol (LDAP)TCP389
Hypertext Transfer Protocol overSSL/TLS (HTTPS)TCP443
Lightweight Directory AccessProtocolover TLS/SSL (LDAPS)TCP636
FTPS — FTP over SSL/TLSTCP989, 990
IMAPS — IMAP over SSL/TLSTCP993
POPS — POP over SSL/TLSTCP995
MSSQL — Microsoft SQL ServerTCP1433
MySQLTCP3306
Remote Desktop Protocol (RDP)TCP3389
Oracle DBTCP2483, 2484
VNC ServerTCP5500, 5900
PCAnywhereTCP5631, 5632
X11TCP6000, 6001