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: 578

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-578 A Newton MA BSTPMALLZMD  506J TWILIO INTERNATIONAL, INC. 128      
857-578 0 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-08-14   
857-578 1 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-07-10   
857-578 2 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-28   
857-578 3 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-28   
857-578 4 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-28   
857-578 5 Newton MA BSTPMALLZMD  506J TWILIO INTERNATIONAL, INC. 128   2020-12-11   
857-578 6 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-02-28   
857-578 7 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-07-10   
857-578 8 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-07-10   
857-578 9 Newton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-07-10   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.