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: TRRYMTMARS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-637 A Terry MT 9636 QWEST CORPORATION 650      
406-637 5 Terry MT 9636 QWEST CORPORATION 650      

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.