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: BLNGMTWE9MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-888 A Old Faithful WY 073H TELNYX LLC 650      
307-888 8 Old Faithful WY 073H TELNYX LLC 650   2017-04-15   
406-290 6 Columbus MT 073H TELNYX LLC 650   2020-09-27   
406-318 2 Billings MT 073H TELNYX LLC 650   2023-01-09   
406-749 8 Colstrip MT 073H TELNYX LLC 650   2024-09-12   
701-940 0 East Fairview ND 073H TELNYX LLC 650   2021-03-05   

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

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