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 DNS Name Resolution and Information Lookup Utilities (nslookup, host and dig)
(Page 2 of 5)
The nslookup Utility
To support all of these needs, modern
TCP/IP implementations come equipped with one or more DNS name resolution
and information lookup utilities. One of the most common DNS diagnostic
utilities is nslookup (name server lookup), which
has been around for many years. The details of how the program is implemented
of course depend on the operating system, though most of them are quite
similar in operation and settings. The utility can normally be used
in two modes: interactive or non-interactive.
Non-Interactive Use of nslookup
The non-interactive version of nslookup
is the simplest, and is most often used when an administrator wants
to just quickly translate a name into an address or vice-versa. It is
run by issuing the nslookup command using the following simple
syntax:
nslookup <host> [<server>]
Here, <host> can
be a DNS domain name, in which case a normal
resolution will be performed, or it may
be an IP address, which will cause nslookup to do a reverse
resolution to return the associated DNS
domain name. The <server> parameter is optional; if
omitted, the program uses the default name server of the host where
the command was issued. Table 290
shows a simple example of non-interactive use of nslookup.
Table 290: DNS Name Resolution Using the nslookup Utility
D:\aa>nslookup
www.pcguide.com
Server: ns1-mar.starband.com
Address: 148.78.249.200
Non-authoritative answer:
Name: pcguide.com
Address: 209.68.14.80
Aliases: www.pcguide.com
|
This example was done on
my home PC that uses the Starband satellite Internet service; it is
configured to use Starbands name server (ns1-mar.starband.com).
The answer provided here is labelled non-authoritative because
it came not from one of the DNS name servers that is a DNS
authority for www.pcguide.com, but rather
the Starband name servers DNS
cache.
Note: It is also possible to specify one or more options to modify the behavior of the lookup in non-interactive mode. These options are the same as the parameters controlled by the nslookup set command described in Table 291; they are specified by preceding them with a dash. For example, nslookup -timeout=10 www.pcguide.com would perform the same lookup as in Table 290 but with the timeout interval set to 10 seconds. |
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.
|