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.

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

Read offline with no ads or diagram watermarks!
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  Name Systems and TCP/IP Name Registration and Name Resolution
           9  TCP/IP Name Systems: Host Tables and Domain Name System (DNS)

Previous Topic/Section
Overview and History of TCP/IP Host Names and Name Systems
Previous Page
Pages in Current Topic/Section
1
234
Next Page
TCP/IP Domain Name System (DNS)
Next Topic/Section

TCP/IP Host Table Name System
(Page 1 of 4)

The pioneers of the modern Internet made the first name system for the suite when they created simple files containing the names and addresses of the machines in the early ARPAnet. This system was so simple that it originally wasn't even formally specified as a “name system” per se. Since the files contained names for network hosts, the process for relating names to addresses was simply called the “host name” mechanism. Later, these files were called host tables, and for this reason I call this technology the TCP/IP host table name system.

As a system, it is extremely simple, since it consists of nothing more than a text file maintained on each machine on the network. This file is normally called “/etc/hosts” on a UNIX system, or HOSTS on a Windows system (usually residing in the main Windows directory). The file usually begins with some comment lines and then lists pairs of IP addresses and host names. A very simplified example (using the modern table structure, which is slightly different than the original host table format) is shown in Table 161.


Table 161: Example TCP/IP Host Table

# Host Database
# This file should contain the addresses and aliases
# for local hosts that share this file.
#
# Each line should take the form:
# <address> <host name>
#
127.0.0.1 localhost
209.68.14.80 www.pcguide.com
216.92.177.143 www.desktopscenes.com
198.175.98.64 ftp.intel.com


Host Table Name Space

The name space and architecture for this system is theoretically flat, with each name being able to take any form without any real structure. Despite this, certain rules were eventually put in place regarding how names should be created, for consistency. As we will see later in this topic, it's also possible to use host tables to support the implementation of a hierarchical name space, which would obviously mean the names would have to be created using that name space’s structural rules.


Previous Topic/Section
Overview and History of TCP/IP Host Names and Name Systems
Previous Page
Pages in Current Topic/Section
1
234
Next Page
TCP/IP Domain Name System (DNS)
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 (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.