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: 241

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
351-241 A Hamilton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
351-241 2 Hamilton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2023-10-23   
351-241 9 Hamilton MA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 128   2025-06-13   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.