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: 284

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-284 A Waterloo MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238      
443-284 0 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
443-284 1 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
443-284 2 Waterloo MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-284 3 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-284 4 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-284 5 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-284 6 Waterloo MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-284 7 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
443-284 8 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   
443-284 9 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-23   

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.