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.

NPA: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 258

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-258 A Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 0 Aurora IL WCHCILBFGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
331-258 1 Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 2 Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 3 Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 4 Aurora IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
331-258 5 Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 6 Aurora IL CHCGILWUIMD  197D VONAGE AMERICA LLC 358      
331-258 7 Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 8 Aurora IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-258 9 Aurora IL CHCGILWUIMD  197D VONAGE AMERICA LLC 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.