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: SLBRMDSBX0X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
667-252 A Salisbury MD 624H ONVOY SPECTRUM, LLC 242      
667-361 A Church Hill MD 624H ONVOY SPECTRUM, LLC 242      
667-467 A Denton MD 624H ONVOY SPECTRUM, LLC 242      
667-665 A Hillsboro MD 624H ONVOY SPECTRUM, LLC 242      
667-669 A Galena MD 624H ONVOY SPECTRUM, LLC 242      
667-775 A Millington MD 624H ONVOY SPECTRUM, LLC 242      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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