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: RCFRILRTX6Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-275 A Rockford IL 495J STRATUS NETWORKS 360      
779-310 A New Milford IL 495J STRATUS NETWORKS 360      
779-313 A Cherry Valley IL 495J STRATUS NETWORKS 360      
779-314 A Rock Cut IL 495J STRATUS NETWORKS 360      
779-315 A Roscoe IL 495J STRATUS NETWORKS 360      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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