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: 667 [Rate centres in NPA 667] [Dial plan for NPA 667]

NXX: 508

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
667-508 A Woodlawn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-06-13   
667-508 0 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-07-20   
667-508 1 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-09-06   
667-508 2 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-10-12   
667-508 3 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2026-06-22   
667-508 4 Woodlawn MD   876D ONVOY, LLC - MD 238   2026-09-28   
667-508 5 Woodlawn MD   876D ONVOY, LLC - MD 238   2026-09-28   
667-508 7 Woodlawn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-06-13   
667-508 8 Woodlawn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-06-13   
667-508 9 Woodlawn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-06-13   

Last updated: Sun, 01 Nov 2026 02:11:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.