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: ONTRCAXF98K

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
909-391 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-395 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-458 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-459 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-460 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-467 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-921 A Upland CA 2319 FRONTIER CALIFORNIA INC. 730      
909-933 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-983 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-984 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-986 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-988 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      

Last updated: Sat, 27 Jul 2019 10:59:49 UTC

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