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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NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 248

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-248 A Billings MT BLNGMTMADS1  9636 QWEST CORPORATION 650      
406-248 1 Billings MT   9636 QWEST CORPORATION 650      
406-248 2 Billings MT   9636 QWEST CORPORATION 650      
406-248 3 Billings MT   9636 QWEST CORPORATION 650      
406-248 4 Billings MT   9636 QWEST CORPORATION 650      
406-248 5 Billings MT   9636 QWEST CORPORATION 650      
406-248 6 Billings MT   9636 QWEST CORPORATION 650      
406-248 7 Billings MT   9636 QWEST CORPORATION 650      
406-248 8 Billings MT   9636 QWEST CORPORATION 650      
406-248 9 Billings MT   9636 QWEST CORPORATION 650      

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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