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: HNPKCA01DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
323-277 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-581 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-582 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-583 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-584 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-585 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-586 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-587 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-588 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-589 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-605 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      
323-826 A Los Angeles: DA 06 CA 9740 PACIFIC BELL 730      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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