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: 277

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
351-277 A Lawrence MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128      
351-277 0 Lawrence MA   892D ONVOY, LLC - MA 128   2017-06-06   
351-277 1 Lawrence MA   515J IP HORIZON LLC 128   2017-07-06   
351-277 2 Lawrence MA   892D ONVOY, LLC - MA 128   2017-12-29   
351-277 3 Lawrence MA   892D ONVOY, LLC - MA 128   2017-12-29   
351-277 4 Lawrence MA   892D ONVOY, LLC - MA 128   2021-02-18   
351-277 5 Lawrence MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2018-01-02   
351-277 6 Lawrence MA   892D ONVOY, LLC - MA 128   2021-02-18   
351-277 7 Lawrence MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2022-11-06   
351-277 8 Lawrence MA   892D ONVOY, LLC - MA 128   2021-02-18   
351-277 9 Lawrence MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2017-06-05   

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.