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: 242

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-242 A Sparrows Point MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-242 0 Sparrows Point MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-242 1 Sparrows Point MD BLTMMDCHFMD  5562 METROPCS, INC. 238   2021-02-07   
443-242 2 Sparrows Point MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238   2007-06-15   
443-242 3 Sparrows Point MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-242 4 Sparrows Point MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-22   
443-242 5 Sparrows Point MD BLTMMDCHFMD  5562 METROPCS, INC. 238   2020-09-27   
443-242 6 Sparrows Point MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2007-10-11   
443-242 7 Sparrows Point MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2005-03-10   
443-242 8 Sparrows Point MD BLTMMDCHXMX  506J TWILIO INTERNATIONAL INC 238   2020-12-26   

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.