Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 857 [Rate centres in NPA 857] [Dial plan for NPA 857]

NXX: 412

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-412 A Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-412 0 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-04-06   
857-412 1 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-18   
857-412 2 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-18   
857-412 3 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-18   
857-412 4 Cambridge MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2026-09-18   
857-412 5 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-18   
857-412 6 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-04-06   
857-412 7 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2016-03-10   
857-412 8 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2016-03-10   
857-412 9 Cambridge MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-04-06   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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