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.

OCN: 671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
925-331 2 Antioch CA   722      
925-331 3 Antioch CA   722      
925-331 9 Antioch CA   722      
925-344 A Livermore CA SNJSCAYB0MD  722      
925-344 0 Livermore CA   722      
925-410 A Pleasanton CA SNJSCAYB0MD  722      
925-410 0 Pleasanton CA   722   2020-09-04   
925-410 1 Pleasanton CA   722   2020-09-04   
925-410 2 Pleasanton CA   722   2020-09-04   
925-410 3 Pleasanton CA   722   2020-09-04   
925-410 4 Pleasanton CA   722   2020-09-04   
925-410 5 Pleasanton CA   722   2020-09-04   
925-410 6 Pleasanton CA   722   2020-09-04   
925-410 7 Pleasanton CA   722   2020-09-04   
925-410 8 Pleasanton CA   722   2020-09-04   
925-410 9 Pleasanton CA   722   2020-09-04   
925-438 A Orinda CA SNJSCAYB0MD  722      
925-438 1 Orinda CA   722      
925-438 9 Orinda CA   722      
925-441 A Antioch CA SNJSCAYB0MD  722      
925-441 5 Antioch CA   722   2022-08-15   
925-441 8 Antioch CA   722   2022-08-15   
925-444 A Lafayette CA SNJSCAYB0MD  722      
925-444 1 Lafayette CA   722      
925-444 2 Lafayette CA   722      
925-444 4 Lafayette CA   722      
925-444 9 Lafayette CA   722      
925-452 A Dublin-San Ramon CA SNJSCAYB0MD  722      
925-452 0 Dublin-San Ramon CA   722      
925-452 1 Dublin-San Ramon CA   722      
925-452 2 Dublin-San Ramon CA   722      
925-452 8 Dublin-San Ramon CA   722      
925-452 9 Dublin-San Ramon CA   722      
925-453 8 Livermore CA   722   2013-09-14   
925-474 A Pleasanton CA SNJSCAYB0MD  722      
925-474 1 Pleasanton CA   722      
925-474 2 Pleasanton CA   722      
925-474 3 Pleasanton CA   722      
925-474 8 Pleasanton CA   722      
925-474 9 Pleasanton CA   722      
925-480 A Bishop Ranch CA SNJSCAYB0MD  722      
925-480 3 Bishop Ranch CA   722      
925-480 4 Bishop Ranch CA   722      
925-482 A Walnut Creek CA SNJSCAYB0MD  722      
925-482 1 Walnut Creek CA   722      
925-482 2 Walnut Creek CA   722      
925-482 3 Walnut Creek CA   722      
925-482 8 Walnut Creek CA   722      
925-482 9 Walnut Creek CA   722      
925-495 6 Livermore CA   722   2017-04-17   

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

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