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: CHTWMABFDS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
617-674 A Cambridge MA 966C DSCI, LLC 128      
617-830 A Boston MA 966c DSCI, LLC 128   2005-04-10   
781-851 A Malden MA 966C DSCI, LLC 128      
857-242 A Cambridge MA 966C DSCI, LLC 128      
978-605 A Danvers MA 966C DSCI, LLC 128      

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

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