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: 271

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-271 A Hinsdale IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-271 0 Hinsdale IL CHCGILWUKMD  939H COMMIO, LLC 358   2021-10-14   
331-271 1 Hinsdale IL CHCGIL24DS6  224C ONVOY, LLC 358   2020-12-19   
331-271 2 Hinsdale IL CHCGIL24DS6  224C ONVOY, LLC 358   2020-12-19   
331-271 3 Hinsdale IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2021-02-11   
331-271 4 Hinsdale IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2021-02-11   
331-271 5 Hinsdale IL CHCGILWUDS4  063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2020-12-20   
331-271 6 Hinsdale IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2021-02-11   
331-271 7 Hinsdale IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2021-02-11   
331-271 8 Hinsdale IL CHCGILWBXSZ  478J NUSO, LLC 358   2020-12-20   
331-271 9 Hinsdale IL CHCGILWBXSZ  478J NUSO, LLC 358   2020-12-20   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.