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List of Common TCP/IP port numbers


Port 21 International Standard FTP port

This is the port used for all FTP based file

transfers, such as with programs like FTP

Voyager, WS_FTP, Cute FTP, FTP NOW, and

many more. (FTP =File Transfer Protocol).

Port 22 International Standard SSH Server Listening port

port used by Secure Shell servers, SSH, to listen

for incoming connections.

Port 23 International Standard Telnet port

The port used by all Telnet applications.

Port 25 International Standard SMTP mail port

Standard port used for SMTP mail delivery. This

is the outgoing mail port used by email programs

such as Outlook Express, Outlook, FoxMaiI, and

hundreds more, and it is also the SMTP

Outgoing port used by mail Servers such as

Axigen Mail Server, CMaiIServer, Lotus Notes,

MaiIEnabIe, Merak Mail Server, Microsoft

Exchange, Novell Group\/\Ase, Qmail, PostCast

Server, PostFix, SendMaiI, SurgeMaiI, TFS

Secure Message Server, V\AnMaiI, or any other

SMTP / ESMTP standards compliant e-mail

MTA (Message Transfer Agent).

Port 42 Microsoft WINS Replication port

port used to replicate NETBIOS name tables

from one Windows Server to another (see port

137 also)

Port 43 International Standard WHOIS port

port used for "WhoIs" requests (for the retrieval

of domain name information) to whois servers.

Port 53 International Standard DNS port for DNS reguests & replies

This port is used by clients and Servers when

exchanging Domain Name information and

routing. (DNS =Domain Name Server).

Port 67 International Standard DHCP port for DHCP reguests &


This is the port used by the DHCP Server and

clients when the clients checks with the DHCP

Server for a new lease and the allocation of an IP

address. (DHCP =Dynamic Host Configuration


Port 79 International Standard Finger command for SMTP

Mailservers - ETRN Finger port

port used by SMTP mail Servers to send ETRN

Finger commands to message queues Servers so

that those message queues servers know that the

mail Servers are online and ready to accept

queued up mail. In short : this is the port which

your email Server will use to send an ETRN

command to your web hosting company’s mail

Servers so that they deliver to you any waiting

incoming mail.

Port 80 International Standard HTTP port - Internet traffic

The port through which most Internet traffic goes

through, through HTTP requests. This is the

port which web browsers use to browse the web.

Port 102 International Standard X.400 port

X.400 is one of the earliest standards for

communications between Message Handling

Systems (MHS) in pre-Internet days. As a result

X.400 includes provisions for the network

communications to include information about the

intended destination medium for the message

(e.g: email, fax, telex, etc...).

In the Windows world this port is used by default

by Microsoft Exchange Server MTAs (Message

Transfer Agent) to communicate with each other

on internal networks with multiple Exchange


Port 110 International Standard POP3 port

Standard port used for POP3 mail delivery and

collection. This is the port normally called the

Incoming Mail port in email programs such as

Outlook Express, Microsoft Outlook, FoxMaiI, and


Port 115 International Standard SFTP port (Secure File Transfer


Port used for FTP file transfers and modifications

over a Secure Shell connection (SSH). This is

sometimes mistakenly called "FTP over SSH"

which it is not- it is actually a completely new file

transfer protocol which includes additional

features such as error detection, resumption of

interrupted transfers, remote file removal, and

enumeration (listing) of remote folders and files.

Additionally, as the protocol operates within the

SSH protocol which secures the connection

through authentication and encryption, this

protocol has the additional advantage ofoperating

within a secure environment, something which

basic FTP lacks totally (passwords and files are

sent as clear text which can easily be intercepted

and deciphered by snooping programs).

Port 119 International Standard Newsgroups port

Port used for newsgroups access.

Port 123 International Standard Network Time Protocol port (NTP)

Port used for checking and synchronising time

with another computer (Time Server). For

example, this is the port which Windows XP and

Windows Vista use when you configure the clock

to automatically synchronize itself with a time

server on the Internet. Ditto when you configure

a Windows Server to synchronize its time over

the Internet.

Port 135 Microsoft RPC Locator Service port

The RPC locator Service (&mote Procedure

Call) maintains a list of networked services that

support RPC and DCOM standards. This list

holds information regarding which ports and IP

addresses the services are currently running on

or listening on. Thanks to this list, other

computers can query this service to find the

details needed to connect to a desired RPC


Port 137 Microsoft NetBIOS Name service port I WINS

Port used by the NetBIOS protocol to find other

computers on a workgroup network. On a Peer

to Peer network this will be done via broadcast.

If a Windows 2000 server or newer is in place,

the discovery of other computers can be done

with a centralised database called a WINS server

(Windows Internet Naming §ervice) thereby

reducing latency and bandwidth usage on the


This is analogous to DNS for Internet domain

names and Microsoft 2000 /2003 Domains.

Port 143 International Standard Internet Message Access Protocol 4

jIMAP4 port)

This port is used by IMAP4 servers.

IMAP is a method of accessing emails stored

remotely on a mail Server (a mailbox). This could

be a mailbox at an ISP or a corporate mailserver

IMAP4 is "the other" message access protocol

- the first one, and most known, being POP3.

IMAP works differently from POP3 : the

connection to the remote mailbox is constant

compared to the Connect-GetMessages-

CIoseConnection method of POP3. IMAP allows

more than one email client to be connected to the

same mailbox at the same time - as a direct

result it is the protocol of choice for hand-held

devices like BIackBerrys as you can have your

laptop, desktop PC, and BlackBerry all connected

to your mailbox at the same time, something

which is not possible with POP3 which requires

exclusive access. Another major plus point of

IMAP is the ability to retrieve pans of the email,

such as the subject only, the message body only,

or the attachments only - this is another reason

for it being the protocol of choice for devices like

BIackBerrys where the user can have the device

configured to download and show only the

message subjects and when the user decides to

open the email in full, then at that point the device

requests, specifically, the only the body of the

message. Last but not least, the IMAP protocol

includes the provision of message status flags

which let the remote client know whether a

message has been read, deleted, replied to, or

fonivarded - again, this is crucial to BlackBerry-

type devices as that is how the IMAP Server can

synchronize messages between the device, the

server, and any other device simultaneously

accessing the same mailbox.

Port 161 International Standard Simple Network Management Protocol

(SNMP port)

UDP port used to manage, configure, and gather

information about network devices (e.g. Firewalls,

Routers) in a unified and uniform manner across

a varied range of manufacturers. Most Server

operating systems, whether Windows or not,

provide support for this protocol.

Note : Home and Small office devices tend to

use UPNP forthis purpose.

Port 179 International Standard Border Gateway Protocol port

The Bordergatewayjrotocol (BGP) is a routing

protocol used to exchange routing information

between routers in autonomous networks.

Port 379 Microsoft Site Replication Serivces (SRS port)

TCP port used by Microsoft Site Replication


This services enables LDAP enabled Servers to

replicate between each other information stored

on Microsoft Active Directory domain Controllers

and Exchange Servers.

Port 389 International Standard Light Weight Directory Access

Protocol port (LDAP port)

TCP port used to find and manage network

resources on an a hierarchical network systems

such as Novell Network Directory Trees (NDS),

and Microsoft Active Directory Sen/ice Domains.

Port 443 International Standard Secure HTTP traffic port (SSL port)

This is the default port used for SSL encrypted

communications (SSL = Secure Socket Layer),

such as, for example, when you login to a secure

site to purchase something. From a System

Administrator’s viewpoint, this is the port that is

used for incoming and outgoing SSL


Port 445 International Standard Microsoft Active Directory and SMB

Protocol port

This port is used by Microsoft Active Directory

services and Microsoft SMB (Server Message

Block) protocols. SMB is also known as

"Microsoft Vwndows Network" and is the main

protocol used by Microsoft Server Operating

Systems for client/Server access, and file and

printer sharing.

Port 465 Google Google Mail Outgoing Mail Server

Google uses this non-standard port for its

Outgoing Mail Server for Google Mail. Use this

port,, and SSL connection

(SMTP Server Authentication) when configuring

your email client for Google Mail (GMAIL).

Port 636 International Standard LDAP over SSL

TCP port used for Lightweight Directory Access

Protocol over Secure Socket Layer connections.

This a standard added to LDAP to prevent the

interception of information and credentials using

the LDAP protocol.

This standard is used by Microsoft Exchange

Server and many other LDAP enabled Server

applications. SEE LDAP PORT: 389

Port 993 International Standard Secure Internet Message Access

Protocol port (Secure IMAP port)

TCP Poit used for SSL Secured IMAP 4 access.

See IMAP4 Poit: 143.

Port 995 Google Google Mail Incoming POP3 Mail

Server (GMAIL port)

Google uses this non-standard port for its POP3

Incoming Mail Server for Google Mail (GMAIL).

Use this port,, and SSL

connection when configuring your email client.

Port 1026 Novell Calendar Access Protocol port (CAP)

Port used by Novell GroupWise for its

Calendar Access Protocol.

port 1026 is used by the Windows Task

Scheduler or other Windows services.

Port 1080 De-Facto Standard SOCKS I Online Chatting I Hotmail

This port is used mainly by applications such as

AOL Instant Messenger for online

chatting. It is also used by Hotmail.

Port 1090 De-Facto Standard Real Audio port

port used by Real Audio video and audio

streaming applications.

Port 1433 Microsoft SQL Server Port & SQL Server

Replication Port

Used by Microsoft SQL server 6 and above for

SQL replication between SQL servers.

Port 1434 Microsoft SQL Server Monitoring Port

Used by Microsoft SQL server to monitor SQL

server performance.

Port 1521 Oracle Default Oracle port

Default port for connection to an Oracle database


Port 1677 Novell Novell GroupWise

Standard port used by Novell GroupV\Ase for

TCP/IP communications between clients and

agents and the GroupV\Ase Post Office Agent


Port 1701 International Standard Layer Two Tunnelling Protocol port

(L2TP port)

A tunnelling and encryption standard used to

connect two Private Business networks together

over an Internet connection to create a Virtual

Private Network (VPN).

This protocol is seen as the replacement to

PPTP (port 1723 listed below).

Port 1720 De-Facto Standard H.323 port

Port used for video conferencing equipment

which usesthe H.323 protocol.

Port 1723 International Standard Point to Point Tunnelling Protocol port

(PPTP port)

A tunnelling and encryption standard used to

connect two Private Business networks together

over an Internet connection (creating one Virtual

Private Network). This is the default protocol for

establishing a VPN on Windows 2000 Server.

Port 1900 Microsoft Media Center Extender - Xbox 360port

UDP inbound. Port used by Microsoft’s Xbox

360 when linking to Media Center.

Port 2409 SPAMFighter SPAMFighter Content Classificationport

UDP inbound and Outbound. Port used by the

SPAMFighter software to communicate with its

servers in order to determine which emails are

spam or not.

Port 3101 Research in Motion Blackbergy Enterprise Server (BES)

Synchronization Port (BES port)

If you have an outbound firewall, then you

will need to open this port (TCP) to

enable the Blackberry Enterprise Server

to synchronize with the Blackberry

devices. Additionally, depending on the

configuration of your particular site, you

may also need to port forward port 3101

from your router to the Blackberry

Enterprise Server.

Port 3306 MySQL AB Default MySQL Port

Default port for connection to a MySQL database


Port 3389 Microsoft Remote Desktop Port & Terminal

Services Port

TCP Inbound & Outbound. Default port used

by Windows XP Remote Desktop Connection

and Microsoft Terminal Server for Remote

Desktop Connections and/or Terminal Services

sessions. For added security it is recommended

to change the Remote Desktop port from its

default to a value of your choice - this can be

changed in the Registry at


minal Server\WinStations\RDP-

Tcp\PortNumber (the "RDP-Tcp" part may have

a different name ifyou renamed your Terminal

Server \ Remote Desktop connection).

Port 3390 Microsoft Media Center Extender - Xbox 360

port TCP Inbound. port used by Microsoft’s Xbox

350 when linking to Media Center.

Port 3535 GoDaddy GoDaddy Secure SMTP Relay port

port used by GoDaddy customers for email

sending using SMTP relay with authentication

over any ISP connection via GoDaddy’s Outgoing

Mail Server, This

enables GoDaddy customers to email from

anywhere without having to constantly change

their email settings to reflect the SMTP Server

corresportding to the Internet connection they are

using at the time - instead they can email through

GoDaddy’s SMTP Relay regardless of where

they are.

Port 4321 De Facto Standard RWHOIS port

port used for “RWhoIs" requests.

Port 4664 Google Google Desktop Search port

Port 5190 America On Line AOL Instant Messenger port

port used by AIM, the_iOL Instant Messenger


Port 5500 DuaIDesk DualDesk port

Default port used by the DuaIDesk remote control


Port 5631 PCAnywhere PCAnywhere 5631 TCP incoming port

port on which a Symantec PC Anywhere host

accepts incoming PC Anywhere connections and

then continues to communicate with the remote

PC. If you have a PC Anywhere host behind a

firewall or firewalled router, then you need to allow

(and possibly port fonxvard) incoming TCP

connections on this port.

Port 5632 PCAnywhere PCAnywhere 5632 UDP incoming port

Port used by Symantec’s PC Anywhere for the

streaming of screen updates during a PC

Anywhere session. If you have a PC Anywhere

host behind a firewall or firewalled router, then

you need to allow (and possibly port fonrvard)

incoming UDP connections on this port.

Port 5900 ReaIVNC Ltd ReaIVNC Default Remote Control Port

(De-facto VNC default This is the default ReaIVNC port for port

port) forwarding to the ReaIVNC host. You

should always change this port from its

default as it is a well-known port for all

VNC remote control programs and it will

therefore be one of the first targets of


Port 7070 Real Networks Real Streaming Audio port

Port used by Real Networks’ audio streaming


Port 7100 Novell Novell GroupWise

Standard port used by Novell GroupV\Ase for

TCP/IP communications between the Message

Transfer Agent (MTA) and other agents.

Port 8000 Mirra Inc Mirra Personal Server

Communications port

Port used by both the Mirra Client running on the

PC, and the Mirra Personal Server, to

communicate with each other. This is a TCP


Port 8080 International Standard HTTP Internet traffic port

The other port through which HTTP Internet

traffic also goes through.

Port 8799 Vodafone UK GPRS Internet Access Proxy port

Port used for GPRS Internet Browsing on the

Vodafone UK mobile phone network. If you are

on Vodafone you typically need to configure your

phone to access the Internet via a proxy on port

8799. The proxy address is :

Port 8880 De Facto Standard CDDB port

Port used by CD mastering software to

communicate with an Internet based CDDB

Server for requests about artist and track names.

Port 9100 Google Google Web Accelerator port

Port used by Google Web Acceleration

technology. Google Web Accelerator supports

natively only Internet Explorer and FireFox at the

time of writing, 2-Sep-2006. Other browsers

need to have their HTTP Proxy configured to :9100.

Port 39720 Lime Wire LLC LimeWire communications port

This is the default port which the LimeWire

peer-to-peer file-sharing program uses (can be

changed by the end-user).