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: SMRCTXXAYMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
737-344 5 San Marcos TX 903C ONVOY, LLC - TX 558   2021-01-25   
737-373 2 San Marcos TX 903C ONVOY, LLC - TX 558   2020-08-16   
737-373 3 San Marcos TX 903C ONVOY, LLC - TX 558   2020-08-16   
737-373 4 San Marcos TX 903C ONVOY, LLC - TX 558   2020-08-16   
737-373 8 San Marcos TX 903C ONVOY, LLC - TX 558   2020-01-27   
737-387 A San Marcos TX 903C ONVOY, LLC - TX 558      
737-387 0 San Marcos TX 903C ONVOY, LLC - TX 558   2023-04-21   
737-387 1 San Marcos TX 903C ONVOY, LLC - TX 558   2023-08-26   
737-387 2 San Marcos TX 903C ONVOY, LLC - TX 558   2024-05-04   
737-387 3 San Marcos TX 903C ONVOY, LLC - TX 558   2024-02-26   
737-387 4 San Marcos TX 903C ONVOY, LLC - TX 558   2024-02-26   
737-387 5 San Marcos TX 903C ONVOY, LLC - TX 558   2024-02-26   
737-387 6 San Marcos TX 903C ONVOY, LLC - TX 558   2024-02-26   
737-392 0 San Marcos TX 903C ONVOY, LLC - TX 558   2024-08-01   
737-392 1 San Marcos TX 903C ONVOY, LLC - TX 558   2024-08-02   
737-392 8 San Marcos TX 903C ONVOY, LLC - TX 558   2025-02-02   
737-392 9 San Marcos TX 903C ONVOY, LLC - TX 558   2025-05-10   
737-422 0 San Marcos TX 903C ONVOY, LLC - TX 558   2025-12-14   
737-520 A Fentress TX 903C ONVOY, LLC - TX 558      
737-520 3 Fentress TX 903C ONVOY, LLC - TX 558   2020-08-15   
737-520 4 Fentress TX 903C ONVOY, LLC - TX 558   2020-08-15   
737-520 5 Fentress TX 903C ONVOY, LLC - TX 558   2019-09-22   
737-520 6 Fentress TX 903C ONVOY, LLC - TX 558   2019-09-22   
737-520 7 Fentress TX 903C ONVOY, LLC - TX 558   2020-08-15   
737-520 8 Fentress TX 903C ONVOY, LLC - TX 558   2020-09-13   
737-520 9 Fentress TX 903C ONVOY, LLC - TX 558   2020-09-13   
737-737 0 San Marcos TX 903C ONVOY, LLC - TX 558   2024-06-07   
737-937 A Martindale TX 903C ONVOY, LLC - TX 558      
737-937 5 Martindale TX 903C ONVOY, LLC - TX 558   2021-04-30   
737-937 6 Martindale TX 903C ONVOY, LLC - TX 558   2021-03-14   
737-937 7 Martindale TX 903C ONVOY, LLC - TX 558   2021-03-14   
737-937 8 Martindale TX 903C ONVOY, LLC - TX 558   2021-04-30   

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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