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: BKFDCA11XLX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
661-372 7 Delano CA 792K CHARTER IP ENABLED SERVICES, LLC 734   2014-06-10   
661-386 A Rosamond CA 792K CHARTER IP ENABLED SERVICES, LLC 734      
661-386 0 Rosamond CA 792K CHARTER IP ENABLED SERVICES, LLC 734   2016-12-16   
661-584 9 Mojave CA 792K CHARTER IP ENABLED SERVICES, LLC 734   2016-12-17   
661-851 5 Earlimart CA 792K CHARTER IP ENABLED SERVICES, LLC 734   2025-12-10   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.