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: 857

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-857 A Newton MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2025-01-03   
857-857 7 Newton MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2025-01-03   
857-857 8 Newton MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2025-01-03   
857-857 9 Newton MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2025-01-03   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.