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: WLSTNDBCDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
701-572 A Williston ND 587A NCC ENTERPRISES 638      
701-577 A Williston ND 587A NCC ENTERPRISES 638      
701-713 1 Williston ND 587A NCC ENTERPRISES 638   2012-11-06   
701-713 2 Williston ND 587A NCC ENTERPRISES 638   2012-11-06   
701-713 3 Williston ND 587A NCC ENTERPRISES 638   2012-11-06   
701-774 A Williston ND 587A NCC ENTERPRISES 638      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.