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: SLBRMDSBX7Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-623 9 Marion MD 792K CHARTER IP ENABLED SERVICES, LLC 242   2020-09-25   
667-317 1 Princess Anne MD 792K CHARTER IP ENABLED SERVICES, LLC 242   2022-11-27   
667-853 5 Pocomoke MD 792K CHARTER IP ENABLED SERVICES, LLC 242   2022-11-28   
667-868 A Crisfield MD 792K CHARTER IP ENABLED SERVICES, LLC 242      
667-868 4 Crisfield MD 792K CHARTER IP ENABLED SERVICES, LLC 242   2020-09-25   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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