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: 872 [Rate centres in NPA 872] [Dial plan for NPA 872]

NXX: 393

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
872-393 A Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2026-05-30   
872-393 0 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2026-05-30   
872-393 1 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2026-05-30   
872-393 2 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2026-05-30   

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.