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.

OCN: 357E YMAX COMMUNICATIONS CORP. - MT

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
406-318 A Billings MT BLNGMTMARMD  650      
406-318 0 Billings MT BLNGMTMARMD  650      
406-334 5 Libby MT CRALIDXXXBX  960      
406-992 A Helena MT HLNAMTMANMD  648      
406-992 0 Helena MT HLNAMTMANMD  648      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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