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: LNNGMIMNXMZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-235 A Dimondale MI 516C AT&T CORP. 346      
517-310 A Mulliken MI 516C AT&T CORP. 346      
517-465 A Albion MI 516C AT&T CORP. 346      
517-742 A Holt MI 516C AT&T CORP. 346      
517-748 A Jackson MI 516C AT&T CORP. 346      

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

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