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.

Switch: DRTPILAA0MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
872-347 A Chicago Zone 01-Calumet IL 0051 SHELCOMM 358   2024-02-09   

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.