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: 574 [Rate centres in NPA 574] [Dial plan for NPA 574]

NXX: 577

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
574-577 A Royal Center IN LGPTINXA2MD  097D ONVOY, LLC - IN 336      
574-577 5 Royal Center IN LGPTINXAJMD  624H ONVOY SPECTRUM, LLC 336   2024-04-28   
574-577 6 Royal Center IN IPLSINATKMD  7314 TELEPORT COMMUNICATIONS AMERICA, LLC - IN 336   2021-09-27   
574-577 7 Royal Center IN LGPTINXA2MD  097D ONVOY, LLC - IN 336   2021-08-27   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.