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: PTISTXPIRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-943 A Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 0 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 1 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 2 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 3 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 4 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 5 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 6 Port Isabel TX 9533 SOUTHWESTERN BELL 568      
956-943 7 Port Isabel TX 9533 SOUTHWESTERN BELL 568      

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

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