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How to find out if you use private IP addresses
Published Date : 16 Apr 2002   Last Updated : 29 Nov 2022   Content Ref: TEC16944  


Operating System(All), MS Windows 10
Part No(none)
SummaryDescribes how to establish if you are using public or private IP addresses on your network.



Procedure

There are three IP ranges that are reserved for networks which do not directly access the Internet. If you use one of these private ranges, you can expand your network without worrying about running out of public IP addresses. However, by using Network Address Translation (NAT), which translates a private IP address to a public one, computers with IPs in these ranges can still access the Internet.

The ranges are:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255

All networks connecting through broadband will have private addresses, with NAT taking place on the broadband grid. If you have an ISDN connection, you may have private addresses, in which case NAT will be performed on your router.


How to establish what IP range is set on a network

On one of your computer, do the following:

Windows 10

  1. Access the Run command by pressing the Windows Logo Key + R and then type cmd.
  2. Click OK to open an MS-DOS prompt.
  3. At the MS-DOS prompt, type ipconfig /all. The IP information will appear within the MS-DOS window.


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