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.

Houston Suburban, TX

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
346-312 8   7138 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 560   2016-01-04   
346-312 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2016-01-22   
346-313 A HSTNTX01GT5  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560      
346-313 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2016-01-22   
346-313 1   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2016-01-22   
346-313 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2015-08-14   
346-313 3   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2015-08-14   
346-313 4   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2015-08-14   
346-313 5   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2015-08-14   
346-313 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2015-08-14   
346-313 7   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2017-04-12   
346-313 8   903C ONVOY, LLC - TX 560   2017-06-30   
346-313 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2015-08-14   
346-340 A HSTNTXYADS5  903C ONVOY, LLC - TX 560      
346-340 0   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 1   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 2   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 3   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 4   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 5   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 6   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 7   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 8   903C ONVOY, LLC - TX 560   2016-02-08   
346-340 9   903C ONVOY, LLC - TX 560   2016-02-08   
346-342 A HSTNTXMOX7X  318J COMCAST IP PHONE, LLC 560      
346-342 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-09-15   
346-342 1   318J COMCAST IP PHONE, LLC 560   2018-07-13   
346-342 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-09-15   
346-342 3   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-09-15   
346-342 4   177F PEERLESS NETWORK OF TEXAS, LLC - TX 560   2018-09-01   
346-342 5   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-07-28   
346-342 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-07-28   
346-342 7   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-07-28   
346-342 8   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-07-28   
346-342 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-07-28   
346-357 A HSTNTX01GT5  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560      
346-357 0   197D VONAGE AMERICA LLC 560   2018-12-06   
346-357 1   197D VONAGE AMERICA LLC 560   2018-12-06   
346-357 2   197D VONAGE AMERICA LLC 560   2018-12-06   
346-357 3   318J COMCAST IP PHONE, LLC 560   2018-10-21   
346-357 4   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-12-09   
346-357 5   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-12-09   
346-357 6   515J IP HORIZON LLC 560   2018-12-09   
346-357 7   515J IP HORIZON LLC 560   2018-12-09   
346-357 8   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-10-20   
346-357 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560   2018-10-20   
346-374 A HSTQTX02EMD  197D VONAGE AMERICA LLC 560      
346-374 0   197D VONAGE AMERICA LLC 560   2019-02-07   
346-374 1   197D VONAGE AMERICA LLC 560   2019-02-07   
346-374 2   197D VONAGE AMERICA LLC 560   2019-02-07   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 >>

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.