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.
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Switch: LARDTXDGRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-326 A Laredo TX 9533 SOUTHWESTERN BELL 566      
956-326 1 Laredo TX 9533 SOUTHWESTERN BELL 566      
956-326 2 Laredo TX 9533 SOUTHWESTERN BELL 566      
956-326 3 Laredo TX 9533 SOUTHWESTERN BELL 566      
956-326 4 Laredo TX 9533 SOUTHWESTERN BELL 566      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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