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 Eff date Disc date Map
310-214 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730     map
310-370 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730     map
310-371 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730     map
310-542 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730     map
310-793 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730     map
310-921 A Redondo CA 2319 FRONTIER CALIFORNIA INC. 730     map

Last updated: Wed, 30 Aug 2017 11:37:56 UTC

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