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.
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Switch: TRNCCAXG37J

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
310-373 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-375 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-378 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-465 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-465 0 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-465 1 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-465 2 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-791 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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