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.

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

NXX: 538

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-538 A Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 1 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 2 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 3 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 4 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 5 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 6 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 7 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 8 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      
406-538 9 Lewistown MT LWTWMTMADS0  9636 QWEST CORPORATION 648      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.