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: CHCGILCPXPX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
331-295 A Aurora IL 732J NUSO, LLC 358      
331-295 1 Aurora IL 732J NUSO, LLC 358   2023-03-31   
331-298 4 Naperville IL 732J NUSO, LLC 358   2024-07-10   
331-312 3 Aurora IL 732J NUSO, LLC 358   2024-01-08   
331-319 5 Aurora IL 732J NUSO, LLC 358   2024-06-14   
331-319 6 Aurora IL 732J NUSO, LLC 358   2024-06-14   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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