Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: EHRNAZXFRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
928-923 A Ehrenberg AZ 4419 FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 730      
928-923 0 Ehrenberg AZ 4419 FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 730      
928-923 7 Ehrenberg AZ 4419 FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 730      
928-923 9 Ehrenberg AZ 4419 FRONTIER COMMUNICATIONS OF THE SOUTHWEST INC. - AZ 730      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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