Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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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   2015-02-26   
331-310 1 Big Rock IL CHCGILWUDS4  063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2015-06-21   
331-310 2 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358   2016-04-23   
331-310 3 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358   2016-04-23   
331-310 4 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358   2020-09-06   
331-310 5 Big Rock IL CHCGIL24XMD  495J STRATUS NETWORKS 358   2020-12-13   
331-310 6 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358   2021-02-12   
331-310 7 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358   2016-03-14   
331-310 8 Big Rock IL CHCGIL24DS6  224C ONVOY, LLC 358   2016-03-14   
331-310 9 Big Rock IL CHCGILWUJMD  073H TELNYX LLC 358   2017-05-08   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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