IIS setting - IP address and Subnet mask Range

Hi,
I do not understand networking much- just a little bit.
Is there any way, I can specify the range of IP addesses into a Group? e.g. Let's say, I have a list of IP addresses from 65.150.28.151 to 65.150.28.200.  I do not want to give an access to any other IP address than these.
What would be the correct Network ID and Subnet mask to identify this range (65.150.28.151 to 65.150.28.200)?  
Would that be Network ID=65.150.28.0  and Subnet mask=255.255.255.0?

I am going to put this information in IIS setting (Directory Security tab-IP Addrsses.. option- Grant Access or Denied access list)
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chinawalAsked:
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flopez235Connect With a Mentor Commented:
That is a very particular group of machines that do not match any subnet mask range.  If you put 65.150.28.0 with subnet mask of 255.255.255.0, that range is 65.150.28.1 to 65.150.28.254.

For what you are trying to do, you will need to add them individually or move IPs to correspond to a sub mask range.

Use a site like http://www.subnet-calculator.com for reference on the ranges each subnet mask incorporates.

Hope this helps.
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