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: ONTRCAXG94L

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
909-673 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 0 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 1 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 3 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 4 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 5 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 6 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 7 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-773 9 Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-923 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-930 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      
909-947 A Ontario CA 2319 FRONTIER CALIFORNIA INC. 730      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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