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: 815 [Rate centres in NPA 815] [Dial plan for NPA 815]

NXX: 454

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-454 A Sheffield IL SHFDILXARS0  1015 FRONTIER NORTH, INC. - IL 368      
815-454 1 Sheffield IL   495J STRATUS NETWORKS 368   2020-08-08   
815-454 2 Sheffield IL   1015 FRONTIER NORTH, INC. - IL 368      
815-454 3 Sheffield IL   224C ONVOY, LLC 368   2021-04-03   
815-454 4 Sheffield IL   224C ONVOY, LLC 368   2021-05-09   
815-454 5 Sheffield IL   224C ONVOY, LLC 368   2020-06-15   
815-454 6 Sheffield IL   624H ONVOY SPECTRUM, LLC 368   2023-07-08   
815-454 7 Sheffield IL   508J CENTURYLINK COMMUNICATIONS, LLC 368   2016-08-05   
815-454 8 Sheffield IL   846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 368   2010-04-15   
815-454 9 Sheffield IL   224C ONVOY, LLC 368   2021-08-12   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.