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: 217

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-217 A Lombard IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-217 0 Lombard IL CHCGILIDXDX  624H ONVOY SPECTRUM, LLC 358   2024-05-06   
331-217 1 Lombard IL CHCGIL24DS6  224C ONVOY, LLC 358   2024-05-20   
331-217 2 Lombard IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-09-10   
331-217 3 Lombard IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-09-10   
331-217 4 Lombard IL BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2024-02-18   
331-217 5 Lombard IL CHCGILWUKMD  939H COMMIO, LLC 358   2024-02-03   
331-217 6 Lombard IL CHCGILWUKMD  939H COMMIO, LLC 358   2024-02-03   
331-217 7 Lombard IL CHCGILWUKMD  939H COMMIO, LLC 358   2024-02-03   
331-217 8 Lombard IL CHCGILWUKMD  939H COMMIO, LLC 358   2024-02-03   
331-217 9 Lombard IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2023-10-25   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.