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: 573 [Rate centres in NPA 573] [Dial plan for NPA 573]

NXX: 373

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
573-373 A Laddonia MO LDDNMOXARS0  1151 BRIGHTSPEED OF EAST MISSOURI, LLC 520      
573-373 0 Laddonia MO STLSMOWQ8MD  073H TELNYX LLC 520   2020-08-01   
573-373 1 Laddonia MO LDDNMOXARS0  1151 BRIGHTSPEED OF EAST MISSOURI, LLC 520      
573-373 2 Laddonia MO LDDNMOXARS0  1151 BRIGHTSPEED OF EAST MISSOURI, LLC 520      
573-373 3 Laddonia MO OVLDMOBK0MD  792K CHARTER IP ENABLED SERVICES, LLC 520   2017-01-12   
573-373 4 Laddonia MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2021-03-06   
573-373 5 Laddonia MO LDDNMOXARS0  1151 BRIGHTSPEED OF EAST MISSOURI, LLC 520      
573-373 7 Laddonia MO STLSMOPLDS4  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 520   2013-10-14   
573-373 8 Laddonia MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2021-10-23   

Last updated: Tue, 29 Sep 2026 03:00:13 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.