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.

Divide, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-267 A WSDMMTXCDS0  2254 SOUTHERN MONTANA TEL. CO. 648      
406-553 A MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-553 3   145J TERRA NOVA TELECOM INC. 648   2025-10-09   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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