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: GRMTILXARS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
815-743 A Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 0 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 1 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 5 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 6 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 7 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 8 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      
815-743 9 Graymont IL 1073 FRONTIER COMMUNICATIONS-PRAIRIE, INC. 366      

Last updated: Fri, 10 Jul 2026 02:55:48 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.