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: 586 [Rate centres in NPA 586] [Dial plan for NPA 586]

NXX: 278

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
586-278 A Center Line MI DTRTMIAPG00  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 340   2021-02-19   
586-278 0 Center Line MI   624H ONVOY SPECTRUM, LLC 340   2022-05-09   
586-278 1 Center Line MI   624H ONVOY SPECTRUM, LLC 340   2022-04-10   
586-278 2 Center Line MI DTRTMIVWDMD  624H ONVOY SPECTRUM, LLC 340   2021-06-13   
586-278 3 Center Line MI   624H ONVOY SPECTRUM, LLC 340   2022-01-30   
586-278 4 Center Line MI   624H ONVOY SPECTRUM, LLC 340   2022-01-30   
586-278 5 Center Line MI DTRTMIBHJMD  506J TWILIO INTERNATIONAL INC 340   2021-07-15   
586-278 6 Center Line MI DTRTMIVWDMD  624H ONVOY SPECTRUM, LLC 340   2021-11-18   
586-278 7 Center Line MI SFLDMIMKBMD  516J TON80 COMMUNICATIONS LLC 340   2021-06-05   
586-278 8 Center Line MI DTRTMIAPG00  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 340   2021-02-19   
586-278 9 Center Line MI DTRTMIAPG00  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 340   2021-02-19   

Last updated: Thu, 04 Aug 2022 23:14:42 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.