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: 528

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
617-528 A Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 0 Cambridge MA BSTNMABLOMD  990E BANDWIDTH.COM CLEC, LLC - MA 128      
617-528 1 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 2 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 3 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 4 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 5 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 6 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 7 Cambridge MA CMBRMA01DS5  7135 TC SYSTEMS, INC. 128      
617-528 8 Cambridge MA CMBSMA01GT4  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 128      
617-528 9 Cambridge MA BSTNMABLOMD  990E BANDWIDTH.COM CLEC, LLC - MA 128      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.