On Mon, 18 Mar 2002, Charles Williams wrote:
> There will be a form with a text box to allow IP address entries as follows:
> 188.8.131.52 184.108.40.206 220.127.116.11
> 18.104.22.168/22.214.171.124 126.96.36.199/188.8.131.52
> The above a just a few examples. I need to be able to grab either the IP
> addresses or the ranges and verify that when an IP is entered at a later
> date and compared to the above types of previously saved data that the IP is
> within the range(s).
> I hope I explained that ok. ;)
> So basically I guess I just need a way of, after retrieving the info from
> the DB, splitting the IP (range(s)) apart and then comparing the IP entered
> to those in the array(?) to verify that it was a good entry.
It's not exactly clear to me what your question is.
But, as to the general question of representing and comparing IP addresses
internally, I guess first you'd want to pick a representation that
efficiently and flexibly captures the values you expect to work with.
Ordinarily I would suggest CIDR subnets but the sample IP addresses you
provided do not comply - they seem to be random numbers. Is this because
you need to deal with arbitrary sets of IP addresses rather than valid
subnets, or because you were just in a hurry while typing your message to
Also, I wouldn't recommend using the slash to identify ranges of IP
addresses, because the slash already has a specific meaning in this
context: the number after it specifies the size of the subnet mask. For
instance, to refer to the range 192.168.34.128-192.168.34.135, you'd write
Anyway, I have a few ideas in mind but with an answer to the above
question I'd be able to give you what may be an optimal representation and
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