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:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-289 A Westminster MD BLTOMDKHDS0  7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-06-30   
443-289 0 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-09-15   
443-289 1 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-09-15   
443-289 2 Westminster MD   7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-06-30   
443-289 3 Westminster MD   7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2011-06-30   
443-289 4 Westminster MD   6664 SPRINT SPECTRUM L.P. 238   2011-10-10   
443-289 5 Westminster MD   6664 SPRINT SPECTRUM L.P. 238   2011-10-10   
443-289 6 Westminster MD   6664 SPRINT SPECTRUM L.P. 238   2011-10-10   
443-289 7 Westminster MD   6664 SPRINT SPECTRUM L.P. 238   2011-11-23   
443-289 8 Westminster MD   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 238   2012-11-24   
443-289 9 Westminster MD   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 238   2014-02-19   

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.