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: HRLNTXDU9MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-809 A Harlingen TX 321J HD CARRIER LLC 568      
956-809 8 Harlingen TX 321J HD CARRIER LLC 568   2023-05-11   
956-809 9 Harlingen TX 321J HD CARRIER LLC 568   2023-05-11   

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

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