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: IRVNCASM1MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
951-588 A Arlington CA 671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
951-749 A Mira Loma CA 671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
951-894 A Murrieta CA 671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
951-916 A Lakeview-Nuevo CA 671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      

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Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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