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: 379

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-379 A Dorchester MA STHMMAGBGT0  7619 RCN TELECOM SERVICES, INC. - MA 128      
617-379 0 Dorchester MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2005-09-01   
617-379 1 Dorchester MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2007-05-24   
617-379 2 Dorchester MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2006-07-14   
617-379 3 Dorchester MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2008-01-29   
617-379 4 Dorchester MA   7135 TC SYSTEMS, INC. 128   2003-11-30   
617-379 5 Dorchester MA CHTWMABF2MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 128   2005-04-10   
617-379 6 Dorchester MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2008-02-15   
617-379 7 Dorchester MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2008-02-15   
617-379 8 Dorchester MA STHMMAGBGT0  7619 RCN TELECOM SERVICES, INC. - MA 128      
617-379 9 Dorchester MA STHMMAGBGT0  7619 RCN TELECOM SERVICES, INC. - MA 128      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.