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.

OCN: 4624 ONEIDA NETWORK SERVICES, INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
309-972 A Rio IL RIO ILABRS0  634      

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.