TCP UDP Ports

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Official List

Port 0 - 1000
Port 1000 - 2000
Port 2000 - 3000
Port 3000 - 4000
Port 4000 - 5000
Port 5000 - 6000
Port 6000 - 7000
Port 7000 - 8000
Port 8000 - 9000
Port 9000 - 10000
Port 10000 - 11000
Port 11000 - 12000
Port 12000 - 13000
Port 13000 - 14000
Port 14000 - 15000
Port 15000 - 16000
Port 16000 - 17000
Port 17000 - 18000
Port 18000 - 19000
Port 19000 - 20000
Port 20000 - 21000
Port 21000 - 22000
Port 22000 - 23000
Port 23000 - 24000
Port 24000 - 25000
Port 25000 - 26000
Port 26000 - 27000
Port 27000 - 28000
Port 28000 - 29000
Port 29000 - 30000
Port 30000 - 31000
Port 31000 - 32000
Port 32000 - 33000
Port 33000 - 34000
Port 34000 - 35000
Port 35000 - 36000
Port 36000 - 37000
Port 37000 - 38000
Port 38000 - 39000
Port 39000 - 40000
Port 40000 - 41000
Port 41000 - 42000
Port 42000 - 43000
Port 43000 - 44000
Port 44000 - 45000
Port 45000 - 46000
Port 46000 - 47000
Port 47000 - 48000
Port 48000 - 49000
Port 49000 - 50000

 

A port is a communication point where one or more computers in a network talk with each other through a program or software. There are about 0-65535 ports assigned to do specific tasks in a PC. Most ports operate with TCP or UDP protocol.

Port numbers are officialy assigned by an organisation called IANA and ports are allocated to various needs to avoid confusion.

Port Types & Classification

Ports are classified into 3 main categories..

  • Well Known Ports (Port numbers 0 - 1023)
  • Registered Ports (Port numbers1024 - 49151)
  • Private or Dynamic Ports (Port numbers 49152 - 65535)

    Well Known Ports
    Well known ports are used by system or processes run by root or with specific previleges. The port numbers range from 0 to 1023.

    Registered Ports
    The registered port numbers range from 1024-49151. Such ports are used by programs run by users in the system.

    Private/Dynamic Ports
    Private ports are not assigned for any specific purpose. its range are from range 49152–65535

Difference TCP vs UDP Protocol

TCP/IP Protocol
UDP Protocol
It is a connection oriented protocol It is connectionless protocol which means it can send packets without establishing connection with the receiver at first.
It has flow control and error correction It is error prone during transmission.
It is not fast and primarily used for data transmission like (http,ssh,smtp,ftp, mail etc.)

It is fast and used mostly for audio and video streaming.
Most common services requiring confirmation of delivery like http,ssh,smtp,ftp, mail etc. use TCP ports

UDP ports are commonly used by services or programs that dont require the confirmation of delivery of packets. Most commonly used is DNS queries using UDP port 53.

 

Commonly Used Port Numbers

The following port numbers are unofficial list of commonly used for linux/unix based servers.

Port Number Protocol
Function
     
21 TCP FTP (File Transfer Protocol)
22 TCP/UDP SSH (ssh,scp copy or sftp)
23 TCP/UDP Telnet
25 TCP/UDP SMTP (for sending outgoing emails)
43 TCP WHOIS function
53 TCP/UDP DNS Server (Domain name service for DNS requests)

67
68

 UDP
TCP 		DHCP Server
DHCP Client
70 TCP Gopher Protocol
79 TCP Finger protocol
110 TCP POP3 (for receiving email)
119 TCP NNTP (Network News Transfer Protocol)
143 TCP/UDP IMAP4 Protocol (for email service)
194 TCP IRC
389 TCP/UDP LDAP (light weight directory access)
443 TCP Secure HTTP over SSL (https)
465 TCP Secure SMTP (email) using SSL
990 TCP/UDP Secure FTP using SSL
993 TCP Secure IMAP protocol over SSL (for emails)
1433 TCP/UDP Microsoft SQL server port
2082 TCP Cpanel default port
2083 TCP Cpanel over SSL
2086 TCP Cpanel Webhost Manager (default)
2087 TCP Cpanel Webhost Manager (with https)
2095 TCP Cpanel Webmail
2096 TCP Cpanel secure webmail over SSL
2222 TCP DirectAdmin Server Control Panel
3306 TCP/UDP MySQL Database Server
4643 TCP Virtuosso Power Panel
5432 TCP PostgreSQL Database Server
8080 TCP HTTP port (alternative one for port 80)
8087 TCP Plesk Control Panel Port (default)
8443 TCP Plesk Server Control Panel over SSL
9999 TCP Urchin Web Analytics
10000 TCP Webmin Server Control Panel
19638 TCP Ensim Server Control Panel

More unofficial list of ports and assignments s available here
Official ports and its assignments are published at the IANA website.

Note: The above published ones are unofficial list compiled from various sources.

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