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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OCN: 793K TWC IP ENABLED SERVICES, LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
956-598 5 Mission TX   568   2014-01-18   
956-598 6 Mission TX   568   2015-01-15   
956-598 7 Mission TX   568   2014-07-10   
956-598 8 Mission TX   568   2014-11-14   
956-599 9 Mission TX   568   2012-07-03   
956-600 7 Mission TX   568   2011-01-14   
956-600 8 Mission TX   568   2016-03-04   
956-601 A Pharr TX HRLNTXHGXYX  568   2025-02-11   
956-601 0 Pharr TX   568   2015-01-17   
956-601 1 Pharr TX   568   2015-02-20   
956-601 2 Pharr TX   568   2015-04-13   
956-602 A Laredo TX   566      
956-602 0 Laredo TX   566   2014-12-19   
956-602 1 Laredo TX   566   2014-12-19   
956-602 8 Laredo TX   566   2015-01-15   
956-603 2 Edinburg TX   568   2016-07-28   
956-608 2 Laredo TX   566   2015-02-20   
956-608 3 Laredo TX   566   2015-03-12   
956-608 4 Laredo TX   566   2015-04-15   
956-609 8 Edinburg TX   568   2015-08-27   
956-609 9 Edinburg TX   568   2015-03-15   
956-615 A Laredo TX   566      
956-615 0 Laredo TX   566   2015-09-04   
956-615 1 Laredo TX   566   2015-09-04   
956-620 3 Brownsville TX   568   2015-11-19   
956-621 A Brownsville TX HRLNTXHGXYX  568   2025-02-11   
956-621 0 Brownsville TX   568      
956-621 1 Brownsville TX   568      
956-621 2 Brownsville TX   568      
956-621 3 Brownsville TX   568      
956-621 4 Brownsville TX   568      
956-621 5 Brownsville TX   568      
956-622 3 Harlingen TX   568   2011-01-14   
956-626 1 San Benito TX   568   2011-01-14   
956-626 2 San Benito TX   568   2015-03-30   
956-626 3 San Benito TX   568   2018-02-26   
956-627 A McAllen TX HRLNTXHGXYX  568   2025-02-11   
956-627 0 McAllen TX   568      
956-627 1 McAllen TX   568      
956-627 2 McAllen TX   568      
956-627 3 McAllen TX   568      
956-627 4 McAllen TX   568      
956-627 5 McAllen TX   568      
956-627 6 McAllen TX   568      
956-636 4 Santa Rosa TX   568   2007-06-13   
956-641 4 Brownsville TX   568   2015-07-17   
956-647 5 Weslaco TX   568   2011-01-14   
956-666 0 Pharr TX   568   2018-02-26   
956-666 9 Pharr TX   568   2017-11-02   
956-667 5 Brownsville TX   568   2016-04-25   

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

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