ip2long and long2ip and a bit of bitwise logic is really all you need.
On Fri, 31 May 2002, Chris Knipe wrote:
> Hi all,
> anyone know of any good pre-written classes or functions to work with IP
> address space?
> I'm looking for things which can verify correct notation of IP addresses
> (fine, that's easy enough), but also verify things like network addresses,
> broadcast addresses, and work out subnet masks when a start and end IP
> address is given...
> Any ideas? I'm sure I can just write my own... But it's going to save me
> allot of time if something like this is out there already for me to use.
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