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: 314

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-314 A Milton MA BSTNMABLOMD  990E BANDWIDTH.COM CLEC, LLC - MA 128      
857-314 0 Milton MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2015-03-30   
857-314 1 Milton MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2015-03-30   
857-314 2 Milton MA   892D ONVOY, LLC - MA 128   2016-03-03   
857-314 3 Milton MA   732H BARR TELL USA, INC. - MA 128   2015-12-31   
857-314 4 Milton MA   892D ONVOY, LLC - MA 128   2016-03-03   
857-314 5 Milton MA   321J HD CARRIER LLC 128   2016-04-11   
857-314 6 Milton MA   892D ONVOY, LLC - MA 128   2016-03-25   
857-314 7 Milton MA   892D ONVOY, LLC - MA 128   2016-03-25   
857-314 8 Milton MA   515J IP HORIZON LLC 128   2015-04-03   
857-314 9 Milton MA   321J HD CARRIER LLC 128   2016-04-11   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.