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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Severna Park, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
667-777 6   145J TERRA NOVA TELECOM INC. 238   2023-08-06   
667-777 7 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2014-08-29   
667-777 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-05-01   
667-777 9 BLTMMDCHX7X  073H TELNYX LLC 238   2017-03-14   

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Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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