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: 747 [Rate centres in NPA 747] [Dial plan for NPA 747]

NXX: 399

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
747-399 A La Crescenta CA LSANCAJWIMD  965H FRACTEL, LLC 730      
747-399 0 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-08-13   
747-399 1 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-08-13   
747-399 2 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-08-13   
747-399 3 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-08-13   
747-399 4 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-12-13   
747-399 5 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-12-13   
747-399 6 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-12-25   
747-399 7 La Crescenta CA   649C ONVOY, LLC - CA 730   2021-12-13   
747-399 9 La Crescenta CA   965H FRACTEL, LLC 730   2021-08-05   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.