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: 508 [Rate centres in NPA 508] [Dial plan for NPA 508]

NXX: 321

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
508-321 A Medway MA NWTNMAWAVMD  318J COMCAST IP PHONE, LLC 128      
508-321 0 Medway MA   318J COMCAST IP PHONE, LLC 128      
508-321 1 Medway MA   318J COMCAST IP PHONE, LLC 128      
508-321 2 Medway MA   318J COMCAST IP PHONE, LLC 128      
508-321 3 Medway MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128   2007-06-15   
508-321 4 Medway MA   829J PAETEC ITEL, LLC 128   2009-10-08   
508-321 5 Medway MA   892D ONVOY, LLC - MA 128   2010-03-15   
508-321 6 Medway MA   892D ONVOY, LLC - MA 128   2010-03-15   
508-321 7 Medway MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2011-02-10   
508-321 8 Medway MA   7135 TC SYSTEMS, INC. 128   2012-11-26   
508-321 9 Medway MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128   2008-08-28   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.