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: 917

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-917 A Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-917 0 Columbia MD   515J IP HORIZON LLC 238   2013-09-06   
443-917 1 Columbia MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 2 Columbia MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-01-30   
443-917 3 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-02-29   
443-917 4 Columbia MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238   2013-07-22   
443-917 5 Columbia MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238   2013-07-22   
443-917 6 Columbia MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 7 Columbia MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
443-917 8 Columbia MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-917 9 Columbia MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.