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: HRLNTXHGXBX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-406 A Harlingen TX 551G NUSO, LLC 568      
956-406 1 Harlingen TX 551G NUSO, LLC 568   2013-05-08   
956-893 8 Harlingen TX 551G NUSO, LLC 568   2018-03-07   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.