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: 426

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-426 A Randallstown MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-426 0 Randallstown MD   829J PAETEC ITEL, LLC 238      
443-426 1 Randallstown MD   829J PAETEC ITEL, LLC 238      
443-426 2 Randallstown MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-12   
443-426 3 Randallstown MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-05-23   
443-426 4 Randallstown MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-08-20   
443-426 5 Randallstown MD   829J PAETEC ITEL, LLC 238   2003-03-04   
443-426 6 Randallstown MD   829J PAETEC ITEL, LLC 238   2006-03-18   
443-426 7 Randallstown MD   829J PAETEC ITEL, LLC 238   2004-06-25   
443-426 8 Randallstown MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-05-05   
443-426 9 Randallstown MD   829J PAETEC ITEL, LLC 238      

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.