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
443-431 A Randallstown MD   2593 CORE COMMUNICATIONS, INC. - MD 238      
443-431 2 Randallstown MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2019-07-31   
443-431 3 Randallstown MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-24   
443-431 4 Randallstown MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-11-24   
443-431 5 Randallstown MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-431 6 Randallstown MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-431 7 Randallstown MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-431 8 Randallstown MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-10-19   
443-431 9 Randallstown MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-08-27   

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.