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: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
310-421 A Redondo CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730      
310-421 0 Redondo CA SNMNCAXPX3Z  649C ONVOY, LLC - CA 730      
310-421 1 Redondo CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
310-421 2 Redondo CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730      
310-421 3 Redondo CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
310-421 4 Redondo CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730      
310-421 5 Redondo CA   6529 T-MOBILE USA, INC. 730      
310-421 6 Redondo CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730      
310-421 7 Redondo CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730      
310-421 8 Redondo CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
310-421 9 Redondo CA LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.