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: 310

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-310 A Big Rock IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358      
331-310 0 Big Rock IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358      
331-310 1 Big Rock IL CHCGILWUDS4  063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358      
331-310 2 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-310 3 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-310 4 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-310 5 Big Rock IL CHCGIL24XMD  495J STRATUS NETWORKS 358      
331-310 6 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-310 7 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-310 8 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-310 9 Big Rock IL CHCGILWUJMD  073H TELNYX LLC 358      

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.