Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 617 [Rate centres in NPA 617] [Dial plan for NPA 617]

NXX: 819

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-819 A Chelsea MA CATNMAAKPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      
617-819 0 Chelsea MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2020-08-24   
617-819 1 Chelsea MA   892D ONVOY, LLC - MA 128   2010-03-15   
617-819 2 Chelsea MA   892D ONVOY, LLC - MA 128   2021-03-06   
617-819 3 Chelsea MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      
617-819 4 Chelsea MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2010-02-19   
617-819 5 Chelsea MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2010-11-15   
617-819 6 Chelsea MA   624H ONVOY SPECTRUM, LLC 128   2021-04-08   
617-819 7 Chelsea MA   892D ONVOY, LLC - MA 128   2021-04-06   
617-819 8 Chelsea MA   892D ONVOY, LLC - MA 128   2010-04-07   
617-819 9 Chelsea MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      

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

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