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.

NPA: 737 [Rate centres in NPA 737] [Dial plan for NPA 737]

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-990 A Austin TX AUSTTXGR46Z  158H INVOXIO INCORPORATED 558      
737-999 A Buda TX AUSTTXGRDS3  319D FOREMOST TELECOMMUNICATIONS CORPORATION - TX 558      

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Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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