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: BSMRNDJCQMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
701-355 A Bismarck ND 490J BOOST SUBSCRIBERCO L.L.C. 638      
701-355 9 Bismarck ND 490J BOOST SUBSCRIBERCO L.L.C. 638   2023-04-30   

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.