Local Calling Guide

Area code/prefix search

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Houston Suburban, TX

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
281-556 0   9533 SOUTHWESTERN BELL 560      
281-556 1   9533 SOUTHWESTERN BELL 560      
281-556 2   9533 SOUTHWESTERN BELL 560      
281-556 3   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2020-01-05   
281-556 4   9533 SOUTHWESTERN BELL 560      
281-556 5   9533 SOUTHWESTERN BELL 560      
281-556 6   9533 SOUTHWESTERN BELL 560      
281-556 7   624H ONVOY SPECTRUM, LLC 560   2021-10-25   
281-556 8   9533 SOUTHWESTERN BELL 560      
281-556 9   9533 SOUTHWESTERN BELL 560      
281-558 A HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-560 A HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-560 0   9533 SOUTHWESTERN BELL 560      
281-560 1   9533 SOUTHWESTERN BELL 560      
281-560 2   9533 SOUTHWESTERN BELL 560      
281-560 3   004F BANDWIDTH.COM CLEC, LLC - TX 560   2011-02-24   
281-560 4   177F PEERLESS NETWORK OF TEXAS, LLC - TX 560   2015-11-09   
281-560 5   9533 SOUTHWESTERN BELL 560      
281-560 6   9533 SOUTHWESTERN BELL 560      
281-560 7   9533 SOUTHWESTERN BELL 560      
281-560 8   9533 SOUTHWESTERN BELL 560      
281-560 9   9533 SOUTHWESTERN BELL 560      
281-561 A HSTNTXALDS0  9533 SOUTHWESTERN BELL 560      
281-564 A HSTNTXALDS0  9533 SOUTHWESTERN BELL 560      
281-568 A HSTNTXALDS0  9533 SOUTHWESTERN BELL 560      
281-575 A HSTNTXALDS0  9533 SOUTHWESTERN BELL 560      
281-582 A HSTOTX42DS2  7074 LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 560      
281-584 A HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-584 0   9533 SOUTHWESTERN BELL 560      
281-584 1   9533 SOUTHWESTERN BELL 560      
281-584 2   9533 SOUTHWESTERN BELL 560      
281-584 3   004F BANDWIDTH.COM CLEC, LLC - TX 560   2011-05-22   
281-584 4   9533 SOUTHWESTERN BELL 560      
281-584 5   9533 SOUTHWESTERN BELL 560      
281-584 6   004F BANDWIDTH.COM CLEC, LLC - TX 560   2011-05-22   
281-584 7   9533 SOUTHWESTERN BELL 560      
281-584 8   9533 SOUTHWESTERN BELL 560      
281-584 9   9533 SOUTHWESTERN BELL 560      
281-588 A HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-588 0   004F BANDWIDTH.COM CLEC, LLC - TX 560   2011-05-22   
281-588 1   9533 SOUTHWESTERN BELL 560      
281-588 2   9533 SOUTHWESTERN BELL 560      
281-588 3   9533 SOUTHWESTERN BELL 560      
281-588 4   9533 SOUTHWESTERN BELL 560      
281-588 5   9533 SOUTHWESTERN BELL 560      
281-588 6   9533 SOUTHWESTERN BELL 560      
281-588 7   9533 SOUTHWESTERN BELL 560      
281-588 8   9533 SOUTHWESTERN BELL 560      
281-588 9   9533 SOUTHWESTERN BELL 560      
281-589 A HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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