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: 391

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-391 A Boston MA CMBRMAWA0MD  3370 CTC COMMUNICATIONS CORP. - MA 128      
617-391 0 Boston MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128      
617-391 1 Boston MA CMBRMAWA0MD  3370 CTC COMMUNICATIONS CORP. - MA 128      
617-391 2 Boston MA CMBRMAWA0MD  4052 CONVERSENT COMMUNICATIONS OF MASSACHUSETTS, LLC 128      
617-391 3 Boston MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128      
617-391 4 Boston MA BSTNMACOVMD  4084 PAETEC COMMUNICATIONS, INC. - MA 128      
617-391 5 Boston MA BSTNMACOVMD  4084 PAETEC COMMUNICATIONS, INC. - MA 128      
617-391 6 Boston MA BSTNMACOVMD  4084 PAETEC COMMUNICATIONS, INC. - MA 128      
617-391 7 Boston MA CMBRMAMQDS3  316E YMAX COMMUNICATIONS CORP. - MA 128      
617-391 8 Boston MA CMBRMAMQDS3  316E YMAX COMMUNICATIONS CORP. - MA 128      
617-391 9 Boston MA CHTWMABF2MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 128      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.