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: LSANCA29DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
323-436 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-512 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-845 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-850 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-851 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-874 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-876 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-878 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-882 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-883 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      
323-969 A Los Angeles: DA 14 CA 9740 PACIFIC BELL 730      

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

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