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: 344

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
351-344 A Gloucester MA   892D ONVOY, LLC - MA 128      
351-344 0 Gloucester MA   892D ONVOY, LLC - MA 128   2022-02-05   
351-344 1 Gloucester MA   624H ONVOY SPECTRUM, LLC 128   2022-02-05   
351-344 2 Gloucester MA   892D ONVOY, LLC - MA 128   2022-02-05   
351-344 3 Gloucester MA   624H ONVOY SPECTRUM, LLC 128   2022-02-05   
351-344 4 Gloucester MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2024-02-10   
351-344 5 Gloucester MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2025-12-17   
351-344 6 Gloucester MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2024-09-29   
351-344 7 Gloucester MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2024-12-26   
351-344 8 Gloucester MA   892D ONVOY, LLC - MA 128   2023-07-03   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.