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.

Shelby, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-424 A SHLBMTALRL0  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 0   073H TELNYX LLC 648   2020-08-13   
406-424 1   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 2   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 4   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 5   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 7   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 8   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-424 9   3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-434 A SHLBMTMADS0  9636 QWEST CORPORATION 648      
406-434 1   624H ONVOY SPECTRUM, LLC 648   2024-12-27   
406-434 2   9636 QWEST CORPORATION 648      
406-434 3   9636 QWEST CORPORATION 648      
406-434 4   145J TERRA NOVA TELECOM INC. 648   2025-10-09   
406-434 5   9636 QWEST CORPORATION 648      
406-434 6   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2005-02-21   
406-434 7   9636 QWEST CORPORATION 648      
406-434 8   453F ONVOY, LLC - MT 648   2007-03-09   
406-434 9   9636 QWEST CORPORATION 648      
406-450 A HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 0   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 1   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 2   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 3   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 4   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 5   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 6   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 8   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-460 A MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-460 0   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-460 1   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-460 2   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-470 A HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-470 0   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-470 1   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2008-10-16   
406-470 2   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2010-01-20   
406-470 4   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2009-04-09   
406-470 6   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2011-02-06   
406-470 7   453F ONVOY, LLC - MT 648   2011-09-30   
406-470 8   453F ONVOY, LLC - MT 648   2019-10-28   
406-470 9   453F ONVOY, LLC - MT 648   2021-07-05   
406-597 A MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-597 6   453F ONVOY, LLC - MT 648   2019-09-15   
406-597 8   453F ONVOY, LLC - MT 648   2023-06-02   
406-966 A MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-966 0   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-966 1   453F ONVOY, LLC - MT 648   2012-12-17   
406-966 2   453F ONVOY, LLC - MT 648   2012-12-17   
406-966 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 648   2014-03-14   
406-966 4   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-966 5   453F ONVOY, LLC - MT 648   2021-03-07   
406-966 6   453F ONVOY, LLC - MT 648   2021-03-07   
406-966 7   508J CENTURYLINK COMMUNICATIONS, LLC 648   2014-05-24   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.