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: GHNTMNXGRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
507-428 A Ghent MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-428 1 Ghent MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-428 3 Ghent MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-428 9 Ghent MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.