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: SLBRMDSB8MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
443-972 A Cambridge MD 2589 US LEC OF MARYLAND, INC. 242      
667-330 A Salisbury MD 2589 US LEC OF MARYLAND, INC. 242   2012-07-21   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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