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: RCFRILRCX3X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-348 A Rockford IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 360      
779-500 A Rockford IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 360      
815-721 A Rockford IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 360      
815-892 A Stillman Valley IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 360      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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