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

Hi,
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.

http://www.hrzdata.com/node/46

http://www.iis.net/configreference/system.webserver/security/ipsecurity

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 65.247.0.0/19
What is that "/19"?  Also, Show I just enter 65.247.0.0 for "IPv4 address range" and "255.255.0.0" for the mask?
Thank you.
0
lapucca
Asked:
lapucca
1 Solution
 
smckeown777Commented:
The /19 is a different way of showing the subnet mask

E.g 255.255.255.0 = /24
255.255.0.0 = 16

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

So 255.255.0.0 = 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 255.255.255.0) 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
11111111.11111111.11100000.00000000
Working to decimal this becomes
255.255.224.0

So you enter(for your example)
65.247.0.0 with mask
255.255.224.0
0
 
lapuccaAuthor Commented:
Great, thank you.
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