What should I enter for IPv4 address range and Mask configuing IP limited website?

Posted on 2012-09-05
Last Modified: 2012-09-06
I followed the instructions here set up a Internet website.  We only want to allow users who are on our network to access the site.

to setup in IIS 7 a website with limited IP access.  When I click on Add Allow Entry, the dialog has a radio button for IPv4 address rang, so I selected that.  There are 2 textboxes.  "IPv4 address range" and "Mask"
I was given ip addresses like
What is that "/19"?  Also, Show I just enter for "IPv4 address range" and "" for the mask?
Thank you.
Question by:lapucca
    LVL 24

    Accepted Solution

    The /19 is a different way of showing the subnet mask

    E.g = /24 = 16

    Basically you work this out by taking each of the sections of the mask and working out in binary

    So = 11111111.11111111.00000000.00000000 - so we have /16 1's and 16 0's
    Which in turn means a /16 subnet mask

    In the /24 example(which is this looks like
    11111111.11111111.11111111.00000000 - note we now have 24 1's, and 8 0's
    So this becomes a /24 subnet mask(i.e. the 24 1's)

    So a /19 works out as
    Working to decimal this becomes

    So you enter(for your example) with mask

    Author Closing Comment

    Great, thank you.

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