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: 248 [Rate centres in NPA 248] [Dial plan for NPA 248]

NXX: 579

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
248-579 A Farmington MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340      
248-579 0 Farmington MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2005-09-10   
248-579 1 Farmington MI SFLDMIDNDS5  9714 GRID 4 COMMUNICATIONS, INC. - MI 340   2006-09-21   
248-579 2 Farmington MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2010-04-29   
248-579 3 Farmington MI LIVNMIUX3MD  5562 METROPCS, INC. 340   2006-02-03   
248-579 4 Farmington MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340      
248-579 5 Farmington MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2010-08-21   
248-579 6 Farmington MI DTRTMIBASMD  516C AT&T CORP. 340   2010-08-19   
248-579 7 Farmington MI LIVNMIUX3MD  5562 METROPCS, INC. 340   2006-02-03   
248-579 8 Farmington MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2010-09-11   
248-579 9 Farmington MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2010-07-02   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.