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.
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Switch: MASNMIMSRSA

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-244 A Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 0 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 1 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 2 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 3 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 4 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 8 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-244 9 Mason MI 9323 MICHIGAN BELL TEL CO 346      
517-676 A Mason MI 9323 MICHIGAN BELL TEL CO 346      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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