Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX: 488

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-488 A Chicago Zone 01-Calumet IL CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-488 0 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2019-02-18   
312-488 1 Chicago Zone 01-Calumet IL CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-10-25   
312-488 2 Chicago Zone 01-Calumet IL CHCGILTCDS4  7056 XO ILLINOIS, INC. 358   2009-10-31   
312-488 3 Chicago Zone 01-Calumet IL CHCGILTCDS4  7056 XO ILLINOIS, INC. 358   2009-10-31   
312-488 4 Chicago Zone 01-Calumet IL CHCGILTCDS4  7056 XO ILLINOIS, INC. 358   2009-10-31   
312-488 5 Chicago Zone 01-Calumet IL BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2010-02-14   
312-488 6 Chicago Zone 01-Calumet IL BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2010-02-14   
312-488 7 Chicago Zone 01-Calumet IL BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2010-02-14   
312-488 8 Chicago Zone 01-Calumet IL CHCGILTCDS4  7056 XO ILLINOIS, INC. 358   2010-02-14   
312-488 9 Chicago Zone 01-Calumet IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   

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

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