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.

Risco, MO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
573-394 A STLSMOGZDS5  225F PEERLESS NETWORK OF MISSOURI, LLC - MO 520      
573-394 0   515J IP HORIZON LLC 520   2023-12-29   
573-394 1   225F PEERLESS NETWORK OF MISSOURI, LLC - MO 520   2013-05-06   
573-394 2   515J IP HORIZON LLC 520   2023-12-29   
573-394 3   093F ONVOY, LLC - MO 520   2016-09-29   
573-394 5   516C AT&T CORP. 520   2011-05-20   
573-394 6   225F PEERLESS NETWORK OF MISSOURI, LLC - MO 520   2013-05-06   
573-394 7   225F PEERLESS NETWORK OF MISSOURI, LLC - MO 520   2025-02-27   
573-394 8   4932 LEVEL 3 COMMUNICATIONS, LLC - MO 520   2017-09-03   
573-394 9   515J IP HORIZON LLC 520   2013-12-19   
573-396 A RISCMOEXRSG  9533 SOUTHWESTERN BELL 520      
573-396 0   073H TELNYX LLC 520   2019-09-30   
573-396 1   9533 SOUTHWESTERN BELL 520      
573-396 3   093F ONVOY, LLC - MO 520   2021-07-24   
573-396 5   9533 SOUTHWESTERN BELL 520      
573-396 9   624H ONVOY SPECTRUM, LLC 520   2025-01-11   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.