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: 464 [Rate centres in NPA 464] [Dial plan for NPA 464]

NXX: 256

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
464-256 A Chicago Heights IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2025-03-13   
464-256 0 Chicago Heights IL   224C ONVOY, LLC 358   2025-03-14   
464-256 1 Chicago Heights IL   224C ONVOY, LLC 358   2025-03-14   
464-256 8 Chicago Heights IL   224C ONVOY, LLC 358   2025-03-14   
464-256 9 Chicago Heights IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2025-03-13   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.