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: HRLNTXDUDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-669 A Harlingen TX 177F PEERLESS NETWORK OF TEXAS, LLC - TX 568      
956-669 0 Harlingen TX 177F PEERLESS NETWORK OF TEXAS, LLC - TX 568   2022-02-27   
956-669 1 Harlingen TX 177F PEERLESS NETWORK OF TEXAS, LLC - TX 568   2023-08-28   
956-669 9 Harlingen TX 177F PEERLESS NETWORK OF TEXAS, LLC - TX 568   2022-02-27   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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