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: SNANTXCAY9X

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-602 1 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2014-12-19   
956-602 8 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2015-01-15   
956-608 2 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2015-02-20   
956-608 3 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2015-03-12   
956-608 4 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2015-04-15   
956-615 A Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566      
956-615 0 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2015-09-04   
956-615 1 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2015-09-04   
956-701 3 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2014-06-01   
956-704 5 Laredo TX 793K TWC IP ENABLED SERVICES, LLC 566   2016-04-25   

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Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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