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.
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OCN: 597J COMPUTER TELEPHONY INNOVATIONS INC. DBA VOXTELESYS

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
701-501 1 Casselton ND   636   2021-02-26   
701-612 A Fargo ND FARGNDBCX6Y  636      
701-612 0 Fargo ND   636   2021-02-26   
701-670 A Grand Forks ND FARGNDBCX6Y  636      
701-670 0 Grand Forks ND   636   2021-03-08   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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