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: HYWRCA01DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-247 A Hayward CA 9740 PACIFIC BELL 722      
510-247 0 Hayward CA 9740 PACIFIC BELL 722      
510-247 1 Hayward CA 9740 PACIFIC BELL 722      
510-247 2 Hayward CA 9740 PACIFIC BELL 722      
510-247 3 Hayward CA 9740 PACIFIC BELL 722      
510-247 5 Hayward CA 9740 PACIFIC BELL 722      
510-247 6 Hayward CA 9740 PACIFIC BELL 722      
510-247 7 Hayward CA 9740 PACIFIC BELL 722      
510-247 8 Hayward CA 9740 PACIFIC BELL 722      
510-247 9 Hayward CA 9740 PACIFIC BELL 722      
510-537 A Hayward CA 9740 PACIFIC BELL 722      
510-538 A Hayward CA 9740 PACIFIC BELL 722      
510-581 A Hayward CA 9740 PACIFIC BELL 722      
510-582 A Hayward CA 9740 PACIFIC BELL 722      
510-583 A Hayward CA 9740 PACIFIC BELL 722      
510-690 A Hayward CA 9740 PACIFIC BELL 722      
510-690 0 Hayward CA 9740 PACIFIC BELL 722      
510-690 1 Hayward CA 9740 PACIFIC BELL 722      
510-690 2 Hayward CA 9740 PACIFIC BELL 722      
510-690 6 Hayward CA 9740 PACIFIC BELL 722      
510-690 9 Hayward CA 9740 PACIFIC BELL 722      
510-727 A Hayward CA 9740 PACIFIC BELL 722      
510-727 0 Hayward CA 9740 PACIFIC BELL 722      
510-727 1 Hayward CA 9740 PACIFIC BELL 722      
510-727 2 Hayward CA 9740 PACIFIC BELL 722      
510-727 3 Hayward CA 9740 PACIFIC BELL 722      
510-727 4 Hayward CA 9740 PACIFIC BELL 722      
510-727 6 Hayward CA 9740 PACIFIC BELL 722      
510-727 7 Hayward CA 9740 PACIFIC BELL 722      
510-727 8 Hayward CA 9740 PACIFIC BELL 722      
510-727 9 Hayward CA 9740 PACIFIC BELL 722      
510-728 A Hayward CA 9740 PACIFIC BELL 722      
510-733 A Hayward CA 9740 PACIFIC BELL 722      
510-881 A Hayward CA 9740 PACIFIC BELL 722      
510-881 0 Hayward CA 9740 PACIFIC BELL 722      
510-881 1 Hayward CA 9740 PACIFIC BELL 722      
510-881 2 Hayward CA 9740 PACIFIC BELL 722      
510-881 4 Hayward CA 9740 PACIFIC BELL 722      
510-881 5 Hayward CA 9740 PACIFIC BELL 722      
510-881 7 Hayward CA 9740 PACIFIC BELL 722      
510-881 8 Hayward CA 9740 PACIFIC BELL 722      
510-881 9 Hayward CA 9740 PACIFIC BELL 722      
510-885 A Hayward CA 9740 PACIFIC BELL 722      
510-886 A Hayward CA 9740 PACIFIC BELL 722      
510-888 A Hayward CA 9740 PACIFIC BELL 722      
510-889 A Hayward CA 9740 PACIFIC BELL 722      
510-889 0 Hayward CA 9740 PACIFIC BELL 722      
510-889 1 Hayward CA 9740 PACIFIC BELL 722      
510-889 2 Hayward CA 9740 PACIFIC BELL 722      
510-889 3 Hayward CA 9740 PACIFIC BELL 722      
510-889 5 Hayward CA 9740 PACIFIC BELL 722      
510-889 6 Hayward CA 9740 PACIFIC BELL 722      
510-889 7 Hayward CA 9740 PACIFIC BELL 722      
510-889 8 Hayward CA 9740 PACIFIC BELL 722      
510-889 9 Hayward CA 9740 PACIFIC BELL 722      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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