I'm reading Google Hacking for Penetration Testers and in book it's said several times operator "numrange" is especially powerful and dangerous. However, they don't give example of using this operator. I found similar claims over the net, however, again, without any example at all how one can use it.
I'm little bit in dark here - I know this operator is dangerous weapon in the hands of a malicious social engineer, but I don't know how one can use this weapon and how to mount self-defence.
I know this operator is used to search for a range of numbers on web. I guess you could use it to track down social numbers (however, I'm not sure how you could pin down a person using the range around social number and not +"insert social number"), phones (let say I know range of phone numbers which is used by targetted organization) and to research an address (to get informations about neighbours). Still, I don't see why this is such an "evil" operator...
So, what is so special about the numrange operator and how can it be used in pen-testing? How can you defend yourself against numrange (not against google hacking as a whole)?