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: 230

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-230 A Odenton MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-230 1 Odenton MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-230 2 Odenton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-03-04   
443-230 3 Odenton MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-07-04   
443-230 4 Odenton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
443-230 5 Odenton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-29   
443-230 6 Odenton MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2016-11-17   
443-230 7 Odenton MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-230 8 Odenton MD   515J IP HORIZON LLC 238   2016-01-04   
443-230 9 Odenton MD   515J IP HORIZON LLC 238   2015-03-23   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.