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: BLNGMT939MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-318 1 Billings MT 145J TERRA NOVA TELECOM INC. 650   2024-12-05   
406-489 6 Sidney MT 145J TERRA NOVA TELECOM INC. 650   2024-09-14   
406-633 8 Laurel MT 145J TERRA NOVA TELECOM INC. 650   2024-12-05   
406-699 4 Hardin MT 145J TERRA NOVA TELECOM INC. 650   2024-05-10   
406-749 6 Colstrip MT 145J TERRA NOVA TELECOM INC. 650   2024-09-12   
406-749 9 Colstrip MT 145J TERRA NOVA TELECOM INC. 650   2024-02-12   
406-919 A Belgrade MT 145J TERRA NOVA TELECOM INC. 650      
406-951 6 Miles City MT 145J TERRA NOVA TELECOM INC. 650   2024-02-12   
406-997 7 Fromberg MT 145J TERRA NOVA TELECOM INC. 650   2024-04-22   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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