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.

Switch: BRHMMIBD7MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-277 A Northville MI 7421 AT&T LOCAL 340      
248-285 A Pontiac MI 7421 AT&T LOCAL 340   2011-03-24   
248-631 A Birmingham MI 7421 AT&T LOCAL 340      
248-648 A Pontiac MI 7421 AT&T LOCAL 340      
313-424 A Detroit Zone 1 MI 7421 AT&T LOCAL 340      
313-633 A Detroit Zone 6 MI 7421 AT&T LOCAL 340      
586-580 A Utica MI 7421 AT&T LOCAL 340      
810-223 A Flint MI 7421 AT&T LOCAL 340      

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

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