Re: Efficiently searching for CIDRs containing an IP address

[Alan McKay <alan(dot)mckay(at)gmail(dot)com>]

Hmmm, I've never done this quite that way, but IPs - especially CIDRs
- are far easier to work with in binary format than in human-readable
format.  At my old workplace about 5 years ago I wrote an IP
management system (PHP/MySQL) that stored the IP in binary and
human-readable formats, but all of the computations and comparisons
and other such stuff always took place with the binary values (binary
stored as a string of 0s and 1s as I recall).

So is this not simply easier to implement with a library of functions
to convert a string to binary and back?  I recall in my implementation
I had only 4 or 5 functions including converting back-and-forth from
binary to human-readable, binary-AND, binary-OR and maybe one or two
others.


-- 
“Mother Nature doesn’t do bailouts.”
         - Glenn Prickett