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: 872 [Rate centres in NPA 872] [Dial plan for NPA 872]

NXX: 900

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
872-900 A Chicago Zone 05-Austin IL   224C ONVOY, LLC 358   2026-02-17   
872-900 0 Chicago Zone 05-Austin IL   224C ONVOY, LLC 358   2026-02-17   
872-900 1 Chicago Zone 05-Austin IL   224C ONVOY, LLC 358   2026-02-18   
872-900 3 Chicago Zone 05-Austin IL   490J BOOST SUBSCRIBERCO L.L.C. 358   2026-07-09   
872-900 4 Chicago Zone 05-Austin IL   490J BOOST SUBSCRIBERCO L.L.C. 358   2026-10-06   
872-900 5 Chicago Zone 05-Austin IL   490J BOOST SUBSCRIBERCO L.L.C. 358   2026-12-05   
872-900 8 Chicago Zone 05-Austin IL   224C ONVOY, LLC 358   2026-02-26   
872-900 9 Chicago Zone 05-Austin IL   224C ONVOY, LLC 358   2026-02-17   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.