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: FRMNMAWARMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
617-231 2 Watertown MA 7421 AT&T - LOCAL 128   2002-07-09   
617-668 3 Watertown MA 7421 AT&T - LOCAL 128   2010-06-03   
781-451 9 Wakefield MA 7421 AT&T - LOCAL 128      
781-472 7 Waltham MA 7421 AT&T - LOCAL 128      
781-482 6 Lexington MA 7421 AT&T - LOCAL 128      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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