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: BLTMMD91DS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-982 A Baltimore MD 2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238      
667-788 A Westminster MD 2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238      

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

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