原始名称记载: Zumigo, Inc.

A computer includes a processor that determines fraud risk levels for phone numbers, by performing the steps of: continually monitoring a network connection for queries received from computers of a plurality of organizations, wherein each of the queries includes a phone number; for each query received, extracting and storing the phone number; for each phone number, determining a likelihood that the phone number has been used fraudulently, based at least on one of: (1) a frequency of the phone number being included in the queries, and (2) a number of different organizations that sent queries including the phone number; and determining a fraud risk level for each phone number based at least on the determined likelihood that the phone number has been used fraudulently, and transmitting a notification to one or more organizations when the fraud risk level of any of the phone numbers exceeds a threshold fraud risk.