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". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||^$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.

The Book is Here... and Now On Sale!

Searchable, convenient, complete TCP/IP information.
The TCP/IP Guide

Custom Search

Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
                9  Usenet (Network News) and the TCP/IP Network News Transfer Protocol (NNTP)
                     9  TCP/IP Network News Transfer Protocol (NNTP)

Previous Topic/Section
NNTP Commands
Previous Page
Pages in Current Topic/Section
Next Page
NNTP Status Responses and Response Codes
Next Topic/Section

NNTP Command Extensions
(Page 2 of 4)

NNTP Transport Extensions

The first group is called the NNTP transport extensions and consists of a small group of related commands that are designed to improve inter-server message propagation. Most of these implement NNTP's stream mode, which provides a more effective way of moving large numbers of articles from one server to another, as described in the topic on inter-server communication. Table 267 describes the new transport commands.

Table 267: NNTP Transport Extensions

Command Code





Set Stream Mode


Used to tell the server that the client wants to operate in stream mode, using the CHECK and TAKETHIS commands.


Check If Article Exists

Message ID

Used in stream mode by a server acting as a client to ask another server if it has a copy of a particular article. The server responds back indicating whether or not it wishes to be sent a copy of the article. This command is similar to IHAVE, except that the client does not have to wait for a reply before sending the next command.


Send Article To Server

Message ID

When a server responds to a CHECK command indicating that it wants a copy of a particular message, the client sends it using this command.


Replicate Articles

List of newsgroups and article numbers

This command was created for the special purpose of copying large numbers of articles from one server to another. It is not widely used.

Previous Topic/Section
NNTP Commands
Previous Page
Pages in Current Topic/Section
Next Page
NNTP Status Responses and Response Codes
Next Topic/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!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $

Home - Table Of Contents - Contact Us

The TCP/IP Guide (
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.