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
443-973 A Ellicott City MD BLTMMDSN5MD  4773 XO MARYLAND, LLC 238      
443-973 0 Ellicott City MD   4773 XO MARYLAND, LLC 238   2010-04-04   
443-973 2 Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-03-21   
443-973 3 Ellicott City MD   7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 238   2008-10-01   
443-973 4 Ellicott City MD   876D ONVOY, LLC - MD 238   2014-09-05   
443-973 5 Ellicott City MD   912D BROADVOX-CLEC, LLC - MD 238   2014-10-17   
443-973 6 Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-973 7 Ellicott City MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-973 8 Ellicott City MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-973 9 Ellicott City MD   4773 XO MARYLAND, LLC 238   2001-11-19   

Last updated: Wed, 10 Apr 2019 01:22:05 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.