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: LSANCA38DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
323-373 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-643 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-730 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-731 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-732 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-733 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-734 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-735 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-737 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      
323-766 A Los Angeles: DA 11 CA 9740 PACIFIC BELL 730      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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