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: HSTNTXEHDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
281-436 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-436 0 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-436 1 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-436 2 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-436 8 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 2 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 4 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 5 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 6 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 7 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-454 8 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-458 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 A Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 1 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 2 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 3 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 4 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 5 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 6 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 7 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 8 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      
281-459 9 Houston Suburban TX 9533 SOUTHWESTERN BELL 560      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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