I guess the devil would be in the details as to how to actually go about the crawling, eg where to start? Perhaps have two different bots, one for crawling google for inurl:contact etc... and one that just starts on random pages, or perhaps at one of those business directories like zoominfo. Or dmoz. Or the yahoo directory (considering it's a paid-only directory now, it would likely lead to more businesses). Or as a start, to test the waters so to speak, just point it at specific preselected domains.
Also it seems like certain industries always use toll-free numbers which negates all of this (eg I've never found blocks of toll-free numbers from the same company together through wardialing. There's 800-alltel1 800-alltel2 etc... but I already knew those).
Obviously searching for 'areacode-001' 'areacode-002' etc... would be a shortcut but it wouldn't find the numbers listed as areacode001 and wouldn't find every instance of areacode.001 but would find some.
Anyone ever thought about this?
Edited by nintendo1889, 24 February 2010 - 11:59 AM.