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: 841

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-841 A Winthrop MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2025-04-11   
617-841 2 Winthrop MA   829J PAETEC ITEL, LLC 128   2004-08-28   
617-841 3 Winthrop MA   892D ONVOY, LLC - MA 128   2020-07-07   
617-841 4 Winthrop MA   892D ONVOY, LLC - MA 128   2021-04-06   
617-841 5 Winthrop MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2010-08-22   
617-841 7 Winthrop MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2014-03-31   
617-841 8 Winthrop MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2008-04-28   
617-841 9 Winthrop MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-05-05   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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