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: 857 [Rate centres in NPA 857] [Dial plan for NPA 857]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-299 A Belmont MA   6664 SPRINT SPECTRUM L.P. 128   2017-11-06   
857-299 0 Belmont MA   892D ONVOY, LLC - MA 128   2019-01-05   
857-299 1 Belmont MA   892D ONVOY, LLC - MA 128   2018-03-03   
857-299 2 Belmont MA   892D ONVOY, LLC - MA 128   2019-02-23   
857-299 3 Belmont MA   892D ONVOY, LLC - MA 128   2019-02-23   
857-299 4 Belmont MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2019-03-07   
857-299 5 Belmont MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2019-03-07   
857-299 6 Belmont MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2019-03-07   
857-299 7 Belmont MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2019-03-07   
857-299 8 Belmont MA   892D ONVOY, LLC - MA 128   2019-01-05   
857-299 9 Belmont MA   6664 SPRINT SPECTRUM L.P. 128   2017-11-06   

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.