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.

Switch: FRMNMAWADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
508-305 A Marlboro MA 7421 AT&T - LOCAL 128      
508-305 0 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 1 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 3 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 4 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 6 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 7 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 8 Marlboro MA 7421 AT&T - LOCAL 128      
508-305 9 Marlboro MA 7421 AT&T - LOCAL 128      
508-407 6 Auburn MA 7421 AT&T - LOCAL 128   2003-09-21   
508-466 A Northboro MA 7421 AT&T - LOCAL 128      
508-779 3 Uxbridge MA 7421 AT&T - LOCAL 128   2006-03-23   
978-449 2 Groton MA 7421 AT&T - LOCAL 128      
978-449 3 Groton MA 7421 AT&T - LOCAL 128      
978-723 A Maynard MA 7421 AT&T - LOCAL 128      
978-723 2 Maynard MA 7421 AT&T - LOCAL 128      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.