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: CHYNWYRFBMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-346 A Cheyenne WY 490J DISH WIRELESS, LLC 654      
307-346 9 Cheyenne WY 490J DISH WIRELESS, LLC 654   2021-09-13   
307-419 6 Cody WY 490J DISH WIRELESS, LLC 654   2024-08-26   

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

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