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: 520

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-520 A Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 0 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 1 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 2 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 3 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 4 Cambridge MA BSTNMABLOMD  990E BANDWIDTH.COM CLEC, LLC - MA 128   2011-03-24   
617-520 5 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 6 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 7 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 8 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      
617-520 9 Cambridge MA CMBRMAWADS2  9102 VERIZON NEW ENGLAND INC. 128      

Last updated: Tue, 15 Jul 2025 18:46:49 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.