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: 351 [Rate centres in NPA 351] [Dial plan for NPA 351]

NXX: 388

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
351-388 A Harvard MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128      
351-388 0 Harvard MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2023-09-18   
351-388 5 Harvard MA SOVLMAABDMD  490J DISH WIRELESS, LLC 128   2024-01-14   
351-388 8 Harvard MA CMBRMABENMD  624H ONVOY SPECTRUM, LLC 128   2021-05-17   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.