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: 776

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-776 A Chelsea MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128      
857-776 0 Chelsea MA   892D ONVOY, LLC - MA 128   2016-02-29   
857-776 1 Chelsea MA   892D ONVOY, LLC - MA 128   2010-03-15   
857-776 2 Chelsea MA   990E BANDWIDTH.COM CLEC, LLC - MA 128      
857-776 3 Chelsea MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2004-09-04   
857-776 4 Chelsea MA   990E BANDWIDTH.COM CLEC, LLC - MA 128      
857-776 6 Chelsea MA   318J COMCAST IP PHONE, LLC 128   2014-06-18   
857-776 7 Chelsea MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2006-03-25   
857-776 8 Chelsea MA   990E BANDWIDTH.COM CLEC, LLC - MA 128      
857-776 9 Chelsea MA   515J IP HORIZON LLC 128      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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