Top Definition
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).
I did a pre-scan in 907 and found tons of test numbers from the Mukluk telephone company.
by NotTheory August 03, 2004
2 Words related to pre-scan

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