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: SFLDMIMKEMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
947-251 9 Oxford MI 490J BOOST SUBSCRIBERCO L.L.C. 340   2022-03-05   
947-257 A Pontiac MI 490J BOOST SUBSCRIBERCO L.L.C. 340      
947-257 9 Pontiac MI 490J BOOST SUBSCRIBERCO L.L.C. 340   2022-03-05   
947-260 4 Birmingham MI 490J BOOST SUBSCRIBERCO L.L.C. 340   2023-07-01   
947-348 0 South Lyon MI 490J BOOST SUBSCRIBERCO L.L.C. 340   2022-04-09   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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