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: BLTMMDCHXUX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-410 A Baltimore MD 624H ONVOY SPECTRUM, LLC 238      
667-250 A Baltimore MD 624H ONVOY SPECTRUM, LLC 238      
667-262 A Baltimore MD 624H ONVOY SPECTRUM, LLC 238      
667-644 A Severna Park MD 624H ONVOY SPECTRUM, LLC 238      
667-647 A North East MD 624H ONVOY SPECTRUM, LLC 238      
667-656 A Edgewood MD 624H ONVOY SPECTRUM, LLC 238      
667-668 A Fallston MD 624H ONVOY SPECTRUM, LLC 238      
667-772 A Sparks-Glencoe MD 624H ONVOY SPECTRUM, LLC 238      
667-778 A Sparrows Point MD 624H ONVOY SPECTRUM, LLC 238      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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