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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NPA: 320 [Rate centres in NPA 320] [Dial plan for NPA 320]

NXX: 417

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-417 A West Danbury MN FRDRWIXA2MD  508J CENTURYLINK COMMUNICATIONS, LLC 352      
320-417 4 West Danbury MN FRDRWIXA4MD  184D ONVOY, LLC - MN 352   2024-04-20   
320-417 7 West Danbury MN FRDRWIXA2MD  508J CENTURYLINK COMMUNICATIONS, LLC 352   2015-02-21   

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

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