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: 279 [Rate centres in NPA 279] [Dial plan for NPA 279]

NXX: 284

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
279-284 A Sacramento: North DA CA   649C ONVOY, LLC - CA 726   2025-04-05   
279-284 0 Sacramento: North DA CA   649C ONVOY, LLC - CA 726   2025-04-05   
279-284 1 Sacramento: North DA CA   649C ONVOY, LLC - CA 726   2025-05-10   
279-284 2 Sacramento: North DA CA   6010 NEW CINGULAR WIRELESS PCS, LLC 726   2025-11-14   
279-284 3 Sacramento: North DA CA   6010 NEW CINGULAR WIRELESS PCS, LLC 726   2025-11-14   
279-284 4 Sacramento: North DA CA   6010 NEW CINGULAR WIRELESS PCS, LLC 726   2025-11-14   
279-284 5 Sacramento: North DA CA   732J NUSO, LLC 726   2025-08-30   
279-284 6 Sacramento: North DA CA   732J NUSO, LLC 726   2025-08-30   
279-284 7 Sacramento: North DA CA   732J NUSO, LLC 726   2025-08-30   
279-284 9 Sacramento: North DA CA   649C ONVOY, LLC - CA 726   2025-11-09   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.