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: 200

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
351-200 A Ashby MA FRMNMAUNCMD  7135 TC SYSTEMS, INC. 128      
351-200 0 Ashby MA   892D ONVOY, LLC - MA 128   2019-01-18   
351-200 1 Ashby MA   073H TELNYX LLC 128   2019-09-21   
351-200 2 Ashby MA   073H TELNYX LLC 128   2019-12-13   
351-200 3 Ashby MA   892D ONVOY, LLC - MA 128   2020-04-18   
351-200 4 Ashby MA   892D ONVOY, LLC - MA 128   2020-04-18   
351-200 5 Ashby MA   892D ONVOY, LLC - MA 128   2020-04-18   
351-200 6 Ashby MA   7135 TC SYSTEMS, INC. 128   2018-08-24   
351-200 7 Ashby MA   892D ONVOY, LLC - MA 128   2020-07-11   
351-200 8 Ashby MA   892D ONVOY, LLC - MA 128   2019-02-23   
351-200 9 Ashby MA   892D ONVOY, LLC - MA 128   2019-02-23   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.