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: 267

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-267 A Lombard IL CHCGILWUIMD  197D VONAGE AMERICA LLC 358      
331-267 0 Lombard IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2021-04-30   
331-267 1 Lombard IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2023-02-15   
331-267 2 Lombard IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2024-11-17   
331-267 3 Lombard IL   197D VONAGE AMERICA LLC 358   2020-11-19   
331-267 4 Lombard IL   224C ONVOY, LLC 358   2021-01-03   
331-267 5 Lombard IL   224C ONVOY, LLC 358   2021-01-03   
331-267 6 Lombard IL   224C ONVOY, LLC 358   2021-01-03   
331-267 7 Lombard IL   224C ONVOY, LLC 358   2021-01-03   
331-267 8 Lombard IL   224C ONVOY, LLC 358   2021-01-03   
331-267 9 Lombard IL   197D VONAGE AMERICA LLC 358   2020-11-19   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.