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: 428

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-428 A Everett MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-428 0 Everett MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2024-03-01   
857-428 1 Everett MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2024-03-01   
857-428 2 Everett MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2023-08-12   
857-428 3 Everett MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2023-08-12   
857-428 5 Everett MA SOVLMAABDMD  490J DISH WIRELESS, LLC 128   2024-09-12   
857-428 6 Everett MA SOVLMAABDMD  490J DISH WIRELESS, LLC 128   2024-06-10   
857-428 7 Everett MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2024-12-06   
857-428 8 Everett MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2024-12-06   
857-428 9 Everett MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2024-12-06   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.