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: DLLATX37DS6

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
972-597 A Italy TX 6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-645 A Italy TX 6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-746 A Irving TX 6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-850 A Dallas TX 6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-914 A Nevada TX 6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-992 A Grand Prairie TX 6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      

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

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