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.
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Switch: STMCAZXEPS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
435-316 A Monument Valley UT 4451 NAVAJO COMM CO INC - UT DBA NAVAJO COMM UT 981      
435-316 4 Monument Valley UT 4451 NAVAJO COMM CO INC - UT DBA NAVAJO COMM UT 981      
505-943 A Shiprock NM 4450 NAVAJO COMM CO INC NM DBA NAVAJO COMM CO NM 664      
505-943 4 Shiprock NM 4450 NAVAJO COMM CO INC NM DBA NAVAJO COMM CO NM 664   2012-05-24   
928-815 A Window Rock AZ 4449 NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 980      
928-815 4 Window Rock AZ 4449 NAVAJO COMM CO INC - AZ DBA FRONTIER NAVAJO COM 980   2011-04-02   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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