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: 399

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
508-399 A Southgate MA PWTCRIHIDSA  9102 VERIZON NEW ENGLAND INC. 128      
508-399 0 Southgate MA   515J IP HORIZON LLC 128   2015-10-24   
508-399 1 Southgate MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2008-12-06   
508-399 2 Southgate MA   9102 VERIZON NEW ENGLAND INC. 128      
508-399 3 Southgate MA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 128   2024-12-04   
508-399 4 Southgate MA   829J PAETEC ITEL, LLC 128   2004-12-23   
508-399 5 Southgate MA   9102 VERIZON NEW ENGLAND INC. 128      
508-399 6 Southgate MA   9102 VERIZON NEW ENGLAND INC. 128      
508-399 7 Southgate MA   9102 VERIZON NEW ENGLAND INC. 128      
508-399 8 Southgate MA   9102 VERIZON NEW ENGLAND INC. 128      
508-399 9 Southgate MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2022-04-01   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.