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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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
857-376 0 Brookline MA 939H COMMIO, LLC 128   2021-08-29   
857-376 2 Brookline MA 939H COMMIO, LLC 128   2021-08-29   
857-379 A Roxbury MA 939H COMMIO, LLC 128   2024-12-28   
857-379 1 Roxbury MA 939H COMMIO, LLC 128   2021-10-11   
857-379 2 Roxbury MA 939H COMMIO, LLC 128   2021-10-11   
857-379 8 Roxbury MA 939H COMMIO, LLC 128   2021-10-11   
857-379 9 Roxbury MA 939H COMMIO, LLC 128   2021-10-11   
857-388 A Somerville MA 939H COMMIO, LLC 128      
857-388 0 Somerville MA 939H COMMIO, LLC 128   2021-11-25   
857-388 1 Somerville MA 939H COMMIO, LLC 128   2021-11-25   
857-388 2 Somerville MA 939H COMMIO, LLC 128   2021-11-25   
857-416 0 Boston MA 939H COMMIO, LLC 128   2024-03-04   
857-443 A Boston MA 939H COMMIO, LLC 128      
857-443 3 Boston MA 939H COMMIO, LLC 128   2017-07-13   
857-467 2 Somerville MA 939H COMMIO, LLC 128   2024-03-04   
857-467 3 Somerville MA 939H COMMIO, LLC 128   2024-03-04   
857-526 8 Quincy MA 939H COMMIO, LLC 128   2024-03-04   
857-550 A Belmont MA 939H COMMIO, LLC 128      
857-550 0 Belmont MA 939H COMMIO, LLC 128   2023-11-26   
857-550 1 Belmont MA 939H COMMIO, LLC 128   2023-11-26   
857-550 2 Belmont MA 939H COMMIO, LLC 128   2023-11-26   
857-550 3 Belmont MA 939H COMMIO, LLC 128   2023-11-26   
857-550 4 Belmont MA 939H COMMIO, LLC 128   2023-11-26   
857-565 1 Brookline MA 939H COMMIO, LLC 128   2024-03-04   
857-565 2 Brookline MA 939H COMMIO, LLC 128   2024-03-04   
857-755 6 Quincy MA 939H COMMIO, LLC 128   2024-03-04   
978-442 9 Lowell MA 939H COMMIO, LLC 128   2024-03-04   
978-600 9 Billerica MA 939H COMMIO, LLC 128   2024-03-04   
978-625 0 Billerica MA 939H COMMIO, LLC 128   2021-09-18   
978-625 1 Billerica MA 939H COMMIO, LLC 128   2021-09-18   
978-645 0 Lawrence MA 939H COMMIO, LLC 128   2021-10-11   
978-677 5 Lowell MA 939H COMMIO, LLC 128   2021-10-16   
978-834 9 Amesbury MA 939H COMMIO, LLC 128   2022-11-11   
978-913 1 Ashby MA 939H COMMIO, LLC 128   2024-03-17   
978-984 8 Lawrence MA 939H COMMIO, LLC 128   2021-10-11   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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