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: 403

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
508-403 A Cataumet MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128      
508-403 0 Cataumet MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2004-12-29   
508-403 1 Cataumet MA   892D ONVOY, LLC - MA 128   2019-02-23   
508-403 2 Cataumet MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2005-05-16   
508-403 3 Cataumet MA   318J COMCAST IP PHONE, LLC 128   2019-11-02   
508-403 4 Cataumet MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128      
508-403 5 Cataumet MA   892D ONVOY, LLC - MA 128   2020-06-07   
508-403 6 Cataumet MA   892D ONVOY, LLC - MA 128   2020-06-07   
508-403 7 Cataumet MA   892D ONVOY, LLC - MA 128   2020-08-21   
508-403 9 Cataumet MA   892D ONVOY, LLC - MA 128   2020-08-21   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.