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: BSMRNDBCXFX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
701-994 A Bismarck ND 515J IP HORIZON LLC 638   2025-05-22   
701-994 1 Bismarck ND 515J IP HORIZON LLC 638   2025-05-22   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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