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: CHYNWYMAXKX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
208-998 A Tygee Valley ID 478J NUSO, LLC 654      
208-998 1 Tygee Valley ID 478J NUSO, LLC 654   2020-10-27   
208-998 6 Tygee Valley ID 478J NUSO, LLC 654   2024-01-04   
208-998 7 Tygee Valley ID 478J NUSO, LLC 654   2024-01-04   
406-574 5 Silvertip MT 478J NUSO, LLC 654   2023-12-09   
406-574 6 Silvertip MT 478J NUSO, LLC 654   2023-12-09   
406-574 8 Silvertip MT 478J NUSO, LLC 654   2020-10-11   
435-281 A Coalville UT 478J NUSO, LLC 660      
435-281 1 Coalville UT 478J NUSO, LLC 660   2021-03-25   
970-489 9 South Cheyenne CO 478J NUSO, LLC 654   2020-10-04   
970-802 0 South Cheyenne CO 478J NUSO, LLC 654   2023-12-28   
970-802 6 South Cheyenne CO 478J NUSO, LLC 654   2023-12-28   

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

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