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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 617 [Rate centres in NPA 617] [Dial plan for NPA 617]

NXX: 440

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-440 A Somerville MA CMBRMAWA0MD  4052 CONVERSENT COMMUNICATIONS OF MASSACHUSETTS, LLC 128      
617-440 0 Somerville MA CMBRMAWA0MD  3370 CTC COMMUNICATIONS CORP. - MA 128   2002-10-13   
617-440 1 Somerville MA CMBRMAWA0MD  4052 CONVERSENT COMMUNICATIONS OF MASSACHUSETTS, LLC 128   2003-02-06   
617-440 2 Somerville MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-04-06   
617-440 3 Somerville MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2004-09-04   
617-440 4 Somerville MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2005-09-18   
617-440 5 Somerville MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2006-04-27   
617-440 6 Somerville MA CMBRMAWA0MD  4052 CONVERSENT COMMUNICATIONS OF MASSACHUSETTS, LLC 128      
617-440 7 Somerville MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2007-08-15   
617-440 8 Somerville MA CMBRMAMQDS3  316E YMAX COMMUNICATIONS CORP. - MA 128   2009-11-16   
617-440 9 Somerville MA BSTPMALLOMD  073H TELNYX LLC 128   2017-04-24   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.