Thanks to all that replied to my original question:

Kurt: Thanks for the detailed explanation on IP and netmask computations

Tom: I grabbed the PDF, you can now remove it.  Thanks for your help!!

Peter




On 7 Aug 2003 at 13:10, AZ Pete wrote:

> Calling all network gurus :)
> 
> My IP network address math is rather rusty (it's been a long time!!).  I have need to calculate whether a given client 
> IP address is within a given network.  Additionally, if there are a list of given networks, which one is the most 
> specific.  I need the math formulas to calculate these figures for use within an application.
> 
> Examples:
> Given the network: 192.168.1.0/24
> Given IP address is: 192.168.1.100
> 
> What is the formula to determine if this client's IP address falls within the network's range.
> 
> Further example
> Given these networks: 192.168.1.0/24 and 192.168.0.0/16
> and the client IP of: 192.168.1.100
> 
> In this case the client's IP falls within both networks. What is the formula to determine which network is the more 
> specific one?
> 
> Any help would be most appreciated.
> Thanks,
> Peter
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