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: HSTNTX08ZMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
346-440 5 Houston Suburban TX 553J WHITESKY COMMUNICATIONS, LLC 560   2021-05-09   
346-453 A Houston TX 553J WHITESKY COMMUNICATIONS, LLC 560      
346-453 1 Houston TX 553J WHITESKY COMMUNICATIONS, LLC 560   2021-03-11   
936-293 5 Huntsville TX 553J WHITESKY COMMUNICATIONS, LLC 560   2021-05-09   
979-398 8 Wallis TX 553J WHITESKY COMMUNICATIONS, LLC 560   2021-05-09   
979-610 0 Bay City TX 553J WHITESKY COMMUNICATIONS, LLC 560   2021-05-09   

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

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