Reply to post: "...no mechanism to prohibit...from a single IP address"

Google, Facebook's CAPTCHAs vanquished by security researchers

Mike Shepherd

"...no mechanism to prohibit...from a single IP address"

I'm not an expert, but (as I understand it), NAT (particularly for mobile connections) places numerous devices on a single public (routeable) address. So insisting that each user have a different IP address would block many legitimate users.

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