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: 616

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
310-616 A El Segundo CA ELSGCA12DS0  9740 PACIFIC BELL 730      
310-616 0 El Segundo CA   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730   2007-03-10   
310-616 1 El Segundo CA   9740 PACIFIC BELL 730      
310-616 2 El Segundo CA   9740 PACIFIC BELL 730      
310-616 3 El Segundo CA   516C AT&T CORP. 730   2006-06-30   
310-616 4 El Segundo CA   624H ONVOY SPECTRUM, LLC 730   2022-04-12   
310-616 5 El Segundo CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2006-04-30   
310-616 6 El Segundo CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2006-07-28   
310-616 7 El Segundo CA   9740 PACIFIC BELL 730      
310-616 8 El Segundo CA   9740 PACIFIC BELL 730      
310-616 9 El Segundo CA   9740 PACIFIC BELL 730      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.