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: GLGTMTMARS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-763 A Gallatin Gateway MT 9636 QWEST CORPORATION 650      
406-763 4 Gallatin Gateway MT 9636 QWEST CORPORATION 650      
406-763 5 Gallatin Gateway MT 9636 QWEST CORPORATION 650      
406-763 9 Gallatin Gateway MT 9636 QWEST CORPORATION 650      

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.