Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
|
NOTE: Using software to mass-download the site degrades the server and is prohibited. If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.
|
|
|
|
TCP/IP Transport Layer Protocol (TCP and UDP) Addressing: Ports and Sockets
Internet Protocol (IP) addresses
are the universally-used main form of addressing on a TCP/IP network.
These network-layer
addresses uniquely identify each network
interface, and as such, serve as the mechanism by which data is routed
to the correct network on the internetwork, and then the correct device
on that network. What some people don't realize, however, is that there
is an additional level of addressing that occurs at the transport layer
in TCP/IP, above that of the IP address. Both of the TCP/IP transport
protocols, TCP and UDP, use the concepts of ports and sockets
for virtual software addressing, to enable the function of many applications
simultaneously on an IP device.
In this section I describe the special
mechanism used for addressing in both TCP and UDP. I begin with a discussion
of TCP/IP application processes, including the client/server nature
of communication, which provides a background for explaining how ports
and sockets are used. I then give an overview of the concept of ports,
and how they enable the multiplexing of data over an IP address. I describe
the way that port numbers are categorized in ranges, and assigned to
server processes for common applications. I explain the concept of ephemeral
port numbers used for clients. I then discuss sockets and their use
for connection identification, including the means by which multiple
devices can talk to a single port on another device. I then provide
a summary table of the most common well-known and registered port numbers.
Quick navigation to subsections and regular topics in this section
|
If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support! |
|
|
Home -
Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.
|