Commonly Used Port Numbers

In the world of networking, accurate information is key to having successful communication between devices. If your data doesn’t know where to go it will simply go nowhere or get dropped by a device on the network. This is why identifiers such as IP addresses, MAC addresses and port numbers are so important.

In this article we will be discussing network ports, how they function and some of the more commonly used port numbers. A port is a 16 bit number that is used to identify what service or process the information in the data packet should be used with at its destination. By using a port number, several computers can use the same application on a server without the data getting mixed up or sent to the wrong place. Port numbers are either assigned by the operating system as needed or are configured manually to work with specific applications or services. They are mainly used in TCP and UDP networks and have an available range of 65,535 possible numbers to use. Ports 0 to 1023 are considered well known ports. Ports 1024 to 49151 are registered ports used by software developers to use with their specific application. Ports 49152 to 65535 are ports available to be used by the public.

Many commonly used programs are assigned their own specific port numbers to assure reliable communication and ease of configuration since there is a standard number or numbers to use. Here is a listing of some of the most commonly use applications or services and their assigned port numbers.

Port Number

Protocol

Description

20 & 21

FTP (File Transfer Protocol)

Used to transfer files between computers over the network or the Internet.

22

SSH (Secure Shell)

A secure method to access devices via a command line over the network or Internet.

23

Telnet

Similar to SSH but not secure.

25

SMTP (Simple Mail Transfer Protocol)

Used to send email from a mail server to a user’s mailbox.

53

DNS (Domain Name System)

Translates names to IP addresses on networks and the Internet.

67 & 68

DHCP (Dynamic Host Configuration Protocol)

Used to assign IP addresses to DHCP enabled devices so they can communicate on the network.

69

TFTP (Trivial File Transfer Protocol)

An unsecure version of FTP.

80

HTTP (Hypertext Transfer Protocol)

The protocol used to access web pages on the Internet.

110

POP3 (Post Office Protocol version 3)

One of the older protocols used to retrieve email from email servers.

119

NNTP (Network News Transport Protocol)

Used for transporting Usenet news articles to NNTP clients.

123

NTP (Network Time Protocol)

Keeps devices on the network synchronized in regards to their time.

143

IMAP4 (Internet Message Access Protocol)

A more robust protocol used to retrieve email from email servers.

161 & 162

SNMP (Simple Network Management Protocol)

Provides the ability for administrators to monitor and configure SNMP enabled devices remotely.

389

LDAP (Lightweight Directory Access Protocol)

Allows for access distributed directory information.

443

HTTPS (Secure Hypertext Transfer Protocol)

Provides a secure connection to websites using SSL or TLS.

993

IMAP4 over SSL

Allows for the use of IMAP4 over secure connections.

995

POP3 over SSL

Allows for the use of POP3 over secure connections.

3389

RDP (Remote Desktop Protocol)

Used by Windows Terminal Server for remote desktop connections.

 

Pin It

Join Us On FaceBook

We Recommend:



Join Us On Twitter

Get insights into the computer industry and regular updates on our site. Click Here

OCT Youtube Channel

New tech tip videos posted on a regular basis. Subscribe today! Click Here

Sponsored

LATEST VIDEOS

Cut Yourself Out a Slice of Data As you probably know...

Mount an ISO Image File in a VirtualBox VM Oracle Vi...

Find Your Wireless Password With Ease Many of us have...

3 Ways to Rename your Computer When you install Windo...

Create a Windows iSCSI Storage Server Microsoft Windo...

Learn about Windows 10 Safe Mode and recovery options ...

RECENT TIPS

Install Your Operating System From a Flash Drive...

Get to Know Your Active Directory Groups Microsoft Acti...

Will the New Microsoft ReFS Replace NTFS? Anyone who us...

Cut Yourself Out a Slice of Data As you probably know...

Get free Microsoft Office compatable software with SoftM...

Boot Your Computer Into Safe Mode to Troubleshoot Issues...

NEWS

WPA2 May Not Be So Secure After All With WPA2 being the...

WPA3 Wireless Security is Coming to Save Us! Wi-Fi is a...

Will Net Neutrality Save or Destroy the Internet? Back ...

Who Will be the Future King of the Processor? When it c...

Microsoft Holds off on its Next Windows 10 Update Thanks...

YouTube taking money away from the little guys I’m sure...