Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A scanning technique in which the scanner performs [backspoofing] on a list of numbers to find out which ones have interesting [CLID] names. Telco test numbers will often have the name of the telco come up (ie. Verizon).