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: 410 [Rate centres in NPA 410] [Dial plan for NPA 410]

NXX: 452

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
410-452 A Cardiff MD CRDFMDCDRS0  9212 VERIZON MARYLAND, INC. 238      
410-452 0 Cardiff MD   9212 VERIZON MARYLAND, INC. 238      
410-452 1 Cardiff MD   829J PAETEC ITEL, LLC 238   2003-02-25   
410-452 2 Cardiff MD   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-05   
410-452 3 Cardiff MD   876D ONVOY, LLC - MD 238   2016-04-04   
410-452 4 Cardiff MD   2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2003-12-25   
410-452 5 Cardiff MD   9212 VERIZON MARYLAND, INC. 238      
410-452 6 Cardiff MD   876D ONVOY, LLC - MD 238   2016-04-04   
410-452 7 Cardiff MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-01-02   
410-452 8 Cardiff MD   9212 VERIZON MARYLAND, INC. 238      
410-452 9 Cardiff MD   9212 VERIZON MARYLAND, INC. 238      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.