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.

Switch: RDBHCAXF37K

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
310-214 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-370 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-371 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-542 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 0 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 1 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 2 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 3 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 4 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 5 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 7 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 8 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-793 9 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 1 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 2 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 3 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 4 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 6 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      
310-921 9 Redondo CA 2319 FRONTIER CALIFORNIA INC. 730      

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.