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: 297

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-297 A Newton MA NWTNMAWAVMD  318J COMCAST IP PHONE, LLC 128      
857-297 0 Newton MA   892D ONVOY, LLC - MA 128   2019-02-11   
857-297 1 Newton MA   892D ONVOY, LLC - MA 128   2019-07-01   
857-297 2 Newton MA   318J COMCAST IP PHONE, LLC 128   2017-10-09   
857-297 3 Newton MA   892D ONVOY, LLC - MA 128   2021-08-14   
857-297 4 Newton MA   892D ONVOY, LLC - MA 128   2021-08-14   
857-297 5 Newton MA   624H ONVOY SPECTRUM, LLC 128   2022-02-27   
857-297 6 Newton MA   624H ONVOY SPECTRUM, LLC 128   2022-02-27   
857-297 7 Newton MA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 128   2020-05-02   
857-297 8 Newton MA   892D ONVOY, LLC - MA 128   2019-07-01   
857-297 9 Newton MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2020-03-18   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.