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.

OCN: 475J CALLWORKS CORPORATION

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
254-489 A Waco TX   556   2022-05-06   
254-489 1 Waco TX   556   2022-05-06   
346-520 A Houston TX HSTNTXJAXPY  560   2021-12-16   
346-520 1 Houston TX   560   2021-12-16   
361-291 A Corpus Christi TX   564   2022-05-05   
361-291 1 Corpus Christi TX   564   2022-05-05   
726-204 A San Antonio TX SNANTXCA92Z  566   2021-06-21   
726-204 1 San Antonio TX SNANTXCA92Z  566   2021-06-21   
737-309 A Austin TX AUSTTXGR67Z  558   2021-12-31   
737-309 1 Austin TX   558   2021-12-31   
806-560 A Amarillo TX   546      
806-560 1 Amarillo TX   546   2022-05-05   
940-335 A Wichita Falls TX   548   2022-05-05   
940-335 1 Wichita Falls TX   548   2022-05-05   
945-229 A Dallas TX DLLSTXRIXOZ  552   2021-12-31   
945-229 1 Dallas TX   552   2021-12-31   
956-676 A Brownsville TX   568   2022-05-05   
956-676 1 Brownsville TX   568   2022-05-05   

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

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