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.

NPA: 701 [Rate centres in NPA 701] [Dial plan for NPA 701]

NXX: 506

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
701-506 A Casselton ND FARGNDBCX7X  452F ONVOY, LLC - ND 636      
701-506 0 Casselton ND   999E BANDWIDTH.COM CLEC, LLC - ND 636   2022-02-21   
701-506 1 Casselton ND   515J IP HORIZON LLC 636   2022-06-19   
701-506 3 Casselton ND   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 636   2022-02-18   
701-506 4 Casselton ND   6701 AERIAL COMMUNICATIONS, INC. 636   2023-01-23   
701-506 5 Casselton ND   6701 AERIAL COMMUNICATIONS, INC. 636   2023-01-23   
701-506 6 Casselton ND   6701 AERIAL COMMUNICATIONS, INC. 636   2023-01-23   
701-506 7 Casselton ND   452F ONVOY, LLC - ND 636   2023-05-22   
701-506 8 Casselton ND   287G MLGC, L.L.C. - ND 636   2022-11-03   
701-506 9 Casselton ND   624H ONVOY SPECTRUM, LLC 636   2024-05-26   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.