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: 978 [Rate centres in NPA 978] [Dial plan for NPA 978]

NXX: 506

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
978-506 A Littleton MA ACTNMAMADS1  9102 VERIZON NEW ENGLAND INC. 128      
978-506 0 Littleton MA   892D ONVOY, LLC - MA 128   2023-06-23   
978-506 1 Littleton MA   892D ONVOY, LLC - MA 128   2016-03-21   
978-506 2 Littleton MA   892D ONVOY, LLC - MA 128   2016-03-21   
978-506 4 Littleton MA   892D ONVOY, LLC - MA 128   2021-08-14   
978-506 5 Littleton MA   318J COMCAST IP PHONE, LLC 128   2015-01-12   
978-506 6 Littleton MA   9102 VERIZON NEW ENGLAND INC. 128      
978-506 7 Littleton MA   508J CENTURYLINK COMMUNICATIONS, LLC 128   2014-04-24   
978-506 8 Littleton MA   892D ONVOY, LLC - MA 128   2023-06-23   
978-506 9 Littleton MA   892D ONVOY, LLC - MA 128   2023-06-23   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.