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Utilization Level or Utilization Threshold

The utilization level in a given geographic area (NPA or rate center) is calculated by dividing all assigned numbers (numerator) by total numbering resources assigned to that carrier in the appropriate geographic region (denominator), and multiplying the result by 100.  Numbering resources activated in the LERG™ Routing Guide (within the preceding 90 calendar days of reporting utilization levels may be excluded from the utilization threshold calculation.

All applicants for growth numbering resources shall achieve a 75% utilization threshold, calculated in accordance with 47 CFR § 52.15 (h), for the rate center in which they are requesting growth numbering resources.


Glossary