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: SNDWILXAPS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-931 A Sandwich IL 1015 FRONTIER NORTH, INC. - IL 358      
779-931 9 Sandwich IL 1015 FRONTIER NORTH, INC. - IL 358   2016-12-26   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.