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: 606 [Rate centres in NPA 606] [Dial plan for NPA 606]

NXX: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
606-421 A Fedscreek KY WNCHKYMAXTY  624H ONVOY SPECTRUM, LLC 466   2024-06-20   
606-421 0 Fedscreek KY WNCHKYMAXTY  624H ONVOY SPECTRUM, LLC 466   2024-06-20   
606-421 2 Fedscreek KY WNCHKYMAXMY  516C AT&T CORP. 466   2024-10-14   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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