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: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX: 363

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-363 A Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 0 Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 1 Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 2 Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 3 Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 4 Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 5 Chicago Zone 01-Monroe IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-363 6 Chicago Zone 01-Monroe IL   460K FIRST COMMUNICATIONS, LLC 358      
312-363 7 Chicago Zone 01-Monroe IL CHCGILMF6MD  6529 T-MOBILE USA, INC. 358      
312-363 8 Chicago Zone 01-Monroe IL CHCGILMF6MD  6529 T-MOBILE USA, INC. 358      
312-363 9 Chicago Zone 01-Monroe IL CHCGILMF6MD  6529 T-MOBILE USA, INC. 358      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.