You can also test whether access to the Internet is working by typing an external address,
such as that for www.yahoo.com (216.115.108.243). If you do not know the IP address of a
particular Internet location, you can use the nslookup command, as explained in the following
section.
From most other IP-enabled operating systems, you can execute the same command at a
command prompt or through a system administration utility.
nslookup
You can use the nslookup command to determine the IP address associated with
an Internet site name. You specify the common name, and the nslookup command
looks up the name in on your DNS server (usually located with your ISP). If that
name is not an entry in your ISP’s DNS table, the request is then referred to
another higher-level server, and so on, until the entry is found. The server then
returns the associated IP address.
On Windows-based computers, you can execute the nslookup command from the
Start menu. Click the Start button, and then click Run. In the Open text box, type
the following:
Nslookup
Click OK. A Command Prompt window displays with a bracket prompt (>). At
the prompt, type the name of the Internet address that you are interested in, such as
www.microsoft.com.
The window will display the associate IP address, if known, as shown below:
Figure 7: Using the nslookup Utility
There may be several addresses associated with an Internet name. This is common for web
sites that receive heavy traffic; they use multiple, redundant servers to carry the same
information.
To exit from the nslookup utility, type exit and press [Enter] at the command prompt.
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