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: 790

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-790 A Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 0 Laredo TX SNAQTXKY7MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 566   2007-05-27   
956-790 1 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 2 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 3 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 4 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 5 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 6 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 7 Laredo TX LARDTXLADS0  9533 SOUTHWESTERN BELL 566      
956-790 8 Laredo TX SNAQTXKY7MD  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 566   2007-06-19   
956-790 9 Laredo TX SNANTX67X7Y  7399 WESTEL, INC. - TX 566   2006-10-20   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.