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.

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

NXX: 458

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
606-458 A Grayson KY ASLDKYXAX1X  506J TWILIO INTERNATIONAL, INC. 466   2024-12-27   
606-458 0 Grayson KY   896E ONVOY, LLC - KY 466   2024-04-19   
606-458 1 Grayson KY   238H CEBRIDGE TELECOM KY, LLC DBA SUDDENLINK COMM 466   2024-04-20   
606-458 3 Grayson KY   490J DISH WIRELESS, LLC 466   2024-09-02   
606-458 4 Grayson KY   490J DISH WIRELESS, LLC 466   2024-05-16   
606-458 5 Grayson KY   506J TWILIO INTERNATIONAL, INC. 466   2024-12-28   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.