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: CHYNWYRF8MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-292 A Cheyenne WY 321J HD CARRIER LLC 654      
307-292 7 Cheyenne WY 321J HD CARRIER LLC 654   2020-11-02   
307-292 8 Cheyenne WY 321J HD CARRIER LLC 654   2020-11-02   
307-292 9 Cheyenne WY 321J HD CARRIER LLC 654   2020-08-08   
307-302 8 Cody WY 321J HD CARRIER LLC 654   2020-10-18   
307-522 2 Rock Springs WY 321J HD CARRIER LLC 654   2020-09-27   

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

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