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: BSMRNDBCSMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
701-333 A Bismarck ND 452F ONVOY, LLC - ND 638      
701-401 A Bismarck ND 452F ONVOY, LLC - ND 638      
701-425 A Bismarck ND 452F ONVOY, LLC - ND 638      
701-502 A Dickinson ND 452F ONVOY, LLC - ND 638      
701-712 A Bismarck ND 452F ONVOY, LLC - ND 638      
701-719 A Belfield ND 452F ONVOY, LLC - ND 638      
701-978 A Williston ND 452F ONVOY, LLC - ND 638      
701-981 A Belfield ND 452F ONVOY, LLC - ND 638      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.