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Valid IP address

Posted on 2001-08-04
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Last Modified: 2010-03-18
I'm setting up some vpn's which means I need each network in its own range. So I need to know the max and minimum number allowed for the third quad.

I'm staying with the 192.168.x.x range and know about the 10.x.x.x range.
For simplicity sake I'm planning on making each network as class C even though I'm aware of the other subnetting options.

What I am not sure of
Is 192.168.255.1/24 a valid ip address for a private network or do I have to back it down to
192.168.254.1/24
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Question by:davidpm
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ifincham earned 50 total points
ID: 6353020
Hi,

The official private address ranges are as follows:

10.0.0.0 - 10.255.255.255  (10/8 prefix)
172.16.0.0 - 172.31.255.255  (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)

See --> http://www.faqs.org/rfcs/rfc1918.html

As you are using a 255.255.255.0 mask then the valid address range could indeed be 192.168.255.1 - 192.168.255.254 if you wished - The network address would be 192.168.255.0 and braodcast address 192.168.255.255 so these could be restricted as host addresses. Its a bit different if you use non-default masks (sub-netting).

Rgds
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Author Comment

by:davidpm
ID: 6354189
Thanks I was just a little insecure about the 255 in the third quad.
But I just came it to my office and switched the network and it worked fine.
Thanks!
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