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: DNTNTXXAX6Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
940-281 A Denton TX 506J TWILIO INTERNATIONAL, INC. 552   2024-12-15   
940-281 7 Denton TX 506J TWILIO INTERNATIONAL, INC. 552   2024-12-16   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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