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: FRVLCAXFRL1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
559-594 A Exeter CA 4420 FRONTIER CALIFORNIA INC. 728      
559-594 4 Exeter CA 4420 FRONTIER CALIFORNIA INC. 728      
559-594 5 Exeter CA 4420 FRONTIER CALIFORNIA INC. 728      
559-594 6 Exeter CA 4420 FRONTIER CALIFORNIA INC. 728      
559-594 9 Exeter CA 4420 FRONTIER CALIFORNIA INC. 728      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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