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.

NPA: 956 [Rate centres in NPA 956] [Dial plan for NPA 956]

NXX: 523

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-523 A Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 0 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 1 Laredo TX SNANTX39TMD  6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 566      
956-523 2 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 3 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 4 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 5 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 6 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 7 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 8 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-523 9 Laredo TX SNANTX91X8X  4290 STPCS JOINT VENTURE, LLC 566      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.