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: 388

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-388 A Sugar Grove IL CHCGILWURMD  965H FRACTEL, LLC 358      
331-388 0 Sugar Grove IL CHCGILCNHMD  073H TELNYX LLC 358   2022-12-05   
331-388 1 Sugar Grove IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358   2023-02-11   
331-388 2 Sugar Grove IL CHCGILMF2MD  6529 T-MOBILE USA, INC. 358   2023-02-11   
331-388 3 Sugar Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-07-03   
331-388 4 Sugar Grove IL   224C ONVOY, LLC 358   2024-03-14   
331-388 7 Sugar Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2022-02-27   
331-388 8 Sugar Grove IL   965H FRACTEL, LLC 358   2021-03-26   
331-388 9 Sugar Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-09-07   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.