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.
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Switch: BLNGMT93BMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-506 A Billings MT 321J HD CARRIER LLC 650      
406-506 0 Billings MT 994E BANDWIDTH.COM CLEC, LLC - MT 650   2022-10-07   
406-506 1 Billings MT 321J HD CARRIER LLC 650   2020-11-01   
406-506 2 Billings MT 321J HD CARRIER LLC 650   2020-11-01   
406-506 9 Billings MT 321J HD CARRIER LLC 650   2020-07-23   
406-520 A Absarokee MT 321J HD CARRIER LLC 650      
406-520 5 Absarokee MT 321J HD CARRIER LLC 650   2020-09-27   
406-520 6 Absarokee MT 321J HD CARRIER LLC 650   2020-11-01   
406-719 8 Fromberg MT 321J HD CARRIER LLC 650   2020-09-27   
406-812 6 Laurel MT 321J HD CARRIER LLC 650   2020-09-27   
406-812 9 Laurel MT 321J HD CARRIER LLC 650   2020-11-01   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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