A method of correcting telephone number porting assignments using a telephone number inventory management system includes providing a telephone number inventory management system. In the system, each telephone number in a plurality of telephone numbers is represented by an active data record. The active data records include data representing the telephone number and data representing a rule relating to the telephone number. The rule relating to the telephone number is selected from a list of rules. Each rule represents a unique combination of actual states for telephone numbers among a plurality of data environments. One of the data environments relates to a porting management system and another of the data environments relates to a telephone number inventory system. The method also includes identifying a specific rule that reflects a discrepancy relating to porting assignments among the plurality of data environments. The method further includes searching the active data records for telephone numbers relating to the specific rule. The method also includes transmitting a command to one of the plurality of data environments to change the porting assignment of each of the telephone numbers relating to the specific rule.