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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Bieber, CA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
530-294 A BIBRCAXFDS0  2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 724      
530-294 0 BIBRCAXFDS0  2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 724      
530-294 1 BIBRCAXFDS0  2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 724      
530-294 5 BIBRCAXFDS0  2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 724      
530-294 7   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 724   2017-08-24   
530-294 9 BIBRCAXFDS0  2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 724      

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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