It’s long been assumed that Spammers use a technique called IP squatting to get around IP reputation lists and to make it harder to find the real source of the spammers. In this blog we’ll take a closer look at Spam operations and their techniques.
more here..............http://www.bgpmon.net/using-bgp-data-to-find-spammers/
more here..............http://www.bgpmon.net/using-bgp-data-to-find-spammers/