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: 590

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-590 A Reisterstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-590 0 Reisterstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-590 1 Reisterstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-590 2 Reisterstown MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-09-10   
443-590 3 Reisterstown MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-01-02   
443-590 4 Reisterstown MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-590 5 Reisterstown MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-590 6 Reisterstown MD BLTMMDCHFMD  5562 METROPCS, INC. 238   2016-12-14   
443-590 7 Reisterstown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-590 8 Reisterstown MD BLTQMD012MD  964H BARR TELL USA, INC. 238   2016-12-17   
443-590 9 Reisterstown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.