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: DLLSTXRIXPZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
214-257 A Dallas TX 7421 AT&T - LOCAL 552      
214-258 A Dallas TX 7421 AT&T - LOCAL 552      
214-259 A Dallas TX 7421 AT&T - LOCAL 552      
214-702 A Dallas Fort Worth Airport TX 7421 AT&T - LOCAL 552      
945-224 A McKinney TX 7421 AT&T - LOCAL 552      
972-246 A Dallas TX 7421 AT&T - LOCAL 552      
972-332 A Allen EACS TX 7421 AT&T - LOCAL 552      
972-531 A Plano TX 7421 AT&T - LOCAL 552      
972-697 A Grand Prairie TX 7421 AT&T - LOCAL 552      
972-750 A Terrell TX 7421 AT&T - LOCAL 552      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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