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: 224 [Rate centres in NPA 224] [Dial plan for NPA 224]

NXX: 644

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
224-644 A Palatine IL   224C ONVOY, LLC 358   2025-05-04   
224-644 0 Palatine IL   224C ONVOY, LLC 358   2025-05-04   
224-644 1 Palatine IL   224C ONVOY, LLC 358   2025-05-04   
224-644 2 Palatine IL   224C ONVOY, LLC 358   2025-07-19   
224-644 3 Palatine IL   224C ONVOY, LLC 358   2025-07-19   
224-644 4 Palatine IL   224C ONVOY, LLC 358   2025-07-19   
224-644 5 Palatine IL   224C ONVOY, LLC 358   2025-10-16   
224-644 6 Palatine IL   145J TERRA NOVA TELECOM INC. 358   2025-10-06   
224-644 7 Palatine IL   224C ONVOY, LLC 358   2026-05-05   
224-644 8 Palatine IL   224C ONVOY, LLC 358   2026-05-05   
224-644 9 Palatine IL   224C ONVOY, LLC 358   2026-05-05   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.