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: 444

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
351-444 A Ipswich MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
351-444 0 Ipswich MA   515J IP HORIZON LLC 128   2016-07-01   
351-444 1 Ipswich MA   073H TELNYX LLC 128   2017-04-28   
351-444 2 Ipswich MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2017-12-21   
351-444 3 Ipswich MA   892D ONVOY, LLC - MA 128   2019-02-08   
351-444 4 Ipswich MA   892D ONVOY, LLC - MA 128   2016-06-02   
351-444 5 Ipswich MA   892D ONVOY, LLC - MA 128   2019-02-08   
351-444 6 Ipswich MA   318J COMCAST IP PHONE, LLC 128   2019-07-05   
351-444 7 Ipswich MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2022-06-13   
351-444 8 Ipswich MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2018-10-07   
351-444 9 Ipswich MA   892D ONVOY, LLC - MA 128   2020-04-18   

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.