IP Math anyone?
joconnor at cybermesa.com
Mon Feb 26 22:44:52 CET 2001
Timothy Grant wrote:
> Hi all,
> I checked Parnassus, but couldn't find anything, so I'll ask
> here. Has anyone done anything with IP math (e.g.,
> 192.168.0.254 + 1 = 192.168.1.1).
You could probably do it by converting the IP address to a number, do
the math, and convert back. I've seen algorithms for doing this.
Given a.b.c.d for an IP address you can convert it to the proper value
a(256^3) + b(256^2) + c(256) + d
So 192.168.0.254 = (192 * long((256 **3))) + (168 * (256 ** 2)) + (0 *
256) + 254 = 3232235774L
You need the long() in there to avoid an integer multiplication error.
You might be able to use '3232235774' directly, or convert back to an ip
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