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: 342

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-342 A Solomons MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-342 1 Solomons MD   829J PAETEC ITEL, LLC 238      
443-342 2 Solomons MD   876D ONVOY, LLC - MD 238   2016-04-04   
443-342 3 Solomons MD   876D ONVOY, LLC - MD 238   2014-09-13   
443-342 4 Solomons MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-01-04   
443-342 5 Solomons MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-02-13   
443-342 6 Solomons MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-07-06   
443-342 7 Solomons MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-342 8 Solomons MD   318J COMCAST IP PHONE, LLC 238   2015-06-16   
443-342 9 Solomons MD   876D ONVOY, LLC - MD 238   2016-04-04   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.