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: HSTNTXJAXJY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
346-428 A Houston TX 478J NUSO, LLC 560      
346-428 1 Houston TX 478J NUSO, LLC 560   2020-09-25   
346-428 2 Houston TX 478J NUSO, LLC 560   2020-09-25   
346-428 3 Houston TX 478J NUSO, LLC 560   2020-09-25   
346-428 4 Houston TX 478J NUSO, LLC 560   2020-09-25   
346-428 5 Houston TX 478J NUSO, LLC 560   2020-09-25   
346-428 6 Houston TX 478J NUSO, LLC 560   2020-09-25   
346-683 5 Westfield TX 478J NUSO, LLC 560   2023-11-26   
346-683 6 Westfield TX 478J NUSO, LLC 560   2023-11-26   
346-797 1 Westfield TX 478J NUSO, LLC 560   2024-06-21   
346-797 2 Westfield TX 478J NUSO, LLC 560   2024-06-21   
832-234 1 Westfield TX 478J NUSO, LLC 560   2020-12-20   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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