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: 660 [Rate centres in NPA 660] [Dial plan for NPA 660]

NXX: 228

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-228 A Montrose MO KSCZMODR3MD  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-228 0 Montrose MO KSCZMODR3MD  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-228 1 Montrose MO KSCYMO55XSY  073H TELNYX LLC 524   2020-08-02   
660-228 2 Montrose MO WRBGMOXAXCX  093F ONVOY, LLC - MO 524   2020-11-13   
660-228 6 Montrose MO WRBGMOXAXCX  093F ONVOY, LLC - MO 524   2020-11-13   
660-228 7 Montrose MO KSCAMO961MD  508J CENTURYLINK COMMUNICATIONS, LLC 524   2013-10-31   
660-228 8 Montrose MO WRBGMOXAXCX  093F ONVOY, LLC - MO 524   2021-07-30   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.