Decimal to Binary or Working with IPs

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Good morning, all.

I'm trying to put together an input form to validate IP addresses we get from our customers. This would be to automatically check if, for instance, the gateway is actually in-range of the provided IP/Netmask combo, which is a common mistake we see. I don't see any built in functions that can work with IP addresses, nor is there a decimal-to-binary/binary-to-decimal set of functions to let me build it myself.

Has anybody tried to tackle this one before?

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