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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Switch: DLLSTX97X8X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
469-809 A Dallas TX 321J HD CARRIER LLC 552      
469-809 9 Dallas TX 321J HD CARRIER LLC 552   2020-04-11   
945-440 4 Plano TX 321J HD CARRIER LLC 552   2026-07-18   
945-440 5 Plano TX 321J HD CARRIER LLC 552   2026-07-18   
945-440 6 Plano TX 321J HD CARRIER LLC 552   2026-07-18   
945-949 A Dallas TX 321J HD CARRIER LLC 552   2025-08-16   
945-949 7 Dallas TX 321J HD CARRIER LLC 552   2025-08-16   
945-949 8 Dallas TX 321J HD CARRIER LLC 552   2025-08-16   
945-949 9 Dallas TX 321J HD CARRIER LLC 552   2025-08-16   
972-328 6 Dallas TX 321J HD CARRIER LLC 552   2026-03-14   
972-328 7 Dallas TX 321J HD CARRIER LLC 552   2026-03-14   
972-328 8 Dallas TX 321J HD CARRIER LLC 552   2026-03-14   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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