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: BLNGMTMADS1

Remotes:

Switch Switch name Switch type
CLSTMTMARS1  COLSTRIP  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-237 A Billings MT 9636 QWEST CORPORATION 650      
406-238 A Billings MT 9636 QWEST CORPORATION 650      
406-245 A Billings MT 9636 QWEST CORPORATION 650      
406-247 A Billings MT 9636 QWEST CORPORATION 650      
406-247 1 Billings MT 9636 QWEST CORPORATION 650      
406-247 2 Billings MT 9636 QWEST CORPORATION 650      
406-247 3 Billings MT 9636 QWEST CORPORATION 650      
406-247 4 Billings MT 9636 QWEST CORPORATION 650      
406-247 5 Billings MT 9636 QWEST CORPORATION 650      
406-247 6 Billings MT 9636 QWEST CORPORATION 650      
406-247 7 Billings MT 9636 QWEST CORPORATION 650      
406-247 8 Billings MT 9636 QWEST CORPORATION 650      
406-248 A Billings MT 9636 QWEST CORPORATION 650      
406-252 A Billings MT 9636 QWEST CORPORATION 650      
406-254 A Billings MT 9636 QWEST CORPORATION 650      
406-255 A Billings MT 9636 QWEST CORPORATION 650      
406-256 A Billings MT 9636 QWEST CORPORATION 650      
406-259 A Billings MT 9636 QWEST CORPORATION 650      
406-371 8 Billings MT 9636 QWEST CORPORATION 650   2006-07-10   
406-373 7 Billings MT 9636 QWEST CORPORATION 650      
406-413 A Billings MT 9636 QWEST CORPORATION 650      
406-413 2 Billings MT 9636 QWEST CORPORATION 650   2015-06-11   
406-413 3 Billings MT 9636 QWEST CORPORATION 650   2015-06-11   
406-413 4 Billings MT 9636 QWEST CORPORATION 650   2015-06-11   
406-657 A Billings MT 9636 QWEST CORPORATION 650      
406-896 A Billings MT 9636 QWEST CORPORATION 650      

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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