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: 310 [Rate centres in NPA 310] [Dial plan for NPA 310]

NXX: 747

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
310-747 A Compton: Compton DA CA IRVNCASM1MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
310-747 0 Compton: Compton DA CA IRVNCASM1MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
310-747 1 Compton: Compton DA CA IRVNCASM1MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
310-747 2 Compton: Compton DA CA LSANCARCDS1  993B CURATEL, LLC - CA 730   2006-12-18   
310-747 3 Compton: Compton DA CA   829J PAETEC ITEL, LLC 730   2004-11-25   
310-747 4 Compton: Compton DA CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2010-10-28   
310-747 5 Compton: Compton DA CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2005-09-28   
310-747 6 Compton: Compton DA CA   515J IP HORIZON LLC 730   2003-10-12   
310-747 7 Compton: Compton DA CA LSANCARC80Z  9262 UTILITY TELECOM GROUP, LLC - CA 730   2006-07-06   
310-747 8 Compton: Compton DA CA BLTNCAADPS2  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 730   2005-09-15   
310-747 9 Compton: Compton DA CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2024-05-13   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.