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: RCFRILRCJMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-353 A Forreston IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
779-354 A Davis IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-209 A Rockford IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-315 A Rockford IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-316 A Rockford IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-323 A Belvidere IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-566 A Belvidere IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-656 A Freeport IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      
815-957 A Rockton IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 360      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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