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: SOVLMAAB6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
351-221 A Lowell MA 939H COMMIO, LLC 128      
351-550 A Clinton MA 939H COMMIO, LLC 128      
617-781 A Dorchester MA 939H COMMIO, LLC 128   2024-04-13   
774-461 A Fall River MA 022H COMMIO, LLC 128      
774-532 A New Bedford MA 939H COMMIO, LLC 128   2024-04-13   
774-536 A Fall River MA 939H COMMIO, LLC 128   2024-04-13   
774-550 A Auburn MA 939H COMMIO, LLC 128      
774-566 A Grafton MA 939H COMMIO, LLC 128      
781-200 A Lynn MA 939H COMMIO, LLC 128   2024-04-13   
781-868 A Weymouth MA 939H COMMIO, LLC 128      
781-967 A Weymouth MA 939H COMMIO, LLC 128   2024-04-13   
857-339 A Roxbury MA 939H COMMIO, LLC 128   2024-04-13   
857-379 A Roxbury MA 939H COMMIO, LLC 128   2024-12-28   
857-388 A Somerville MA 939H COMMIO, LLC 128      
857-443 A Boston MA 939H COMMIO, LLC 128      
857-550 A Belmont MA 939H COMMIO, LLC 128      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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