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: 820 [Rate centres in NPA 820] [Dial plan for NPA 820]

NXX: 247

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
820-247 A Newbury Park CA   649C ONVOY, LLC - CA 730   2026-04-11   
820-247 0 Newbury Park CA   649C ONVOY, LLC - CA 730   2026-04-11   
820-247 1 Newbury Park CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2026-07-05   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.