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: 565

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-565 A Randallstown MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-565 0 Randallstown MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-565 1 Randallstown MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-565 2 Randallstown MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC DBA T-MOBILE USA 238   2015-10-09   
443-565 3 Randallstown MD BLTMMDCHXMX  506J TWILIO INTERNATIONAL INC 238   2020-12-26   
443-565 4 Randallstown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
443-565 5 Randallstown MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2021-01-28   
443-565 6 Randallstown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
443-565 7 Randallstown MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS LLC 238   2014-06-25   
443-565 8 Randallstown MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2021-03-24   
443-565 9 Randallstown MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.