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: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 663

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-663 A Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 0 Woodlawn MD   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-20   
443-663 1 Woodlawn MD   145J TERRA NOVA TELECOM INC. 238   2024-09-11   
443-663 2 Woodlawn MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-663 3 Woodlawn MD   876D ONVOY, LLC - MD 238   2016-03-14   
443-663 4 Woodlawn MD   876D ONVOY, LLC - MD 238   2015-10-05   
443-663 5 Woodlawn MD   876D ONVOY, LLC - MD 238   2016-03-14   
443-663 6 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-663 7 Woodlawn MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-663 8 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-663 9 Woodlawn MD   515J IP HORIZON LLC 238   2016-05-31   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.