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: 992

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-992 A Blackburn MO KSCZMODR3MD  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-992 0 Blackburn MO KSCZMODR3MD  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-992 2 Blackburn MO KSCYMO55XYY  624H ONVOY SPECTRUM, LLC 524   2021-11-18   
660-992 3 Blackburn MO KSCYMO55XYY  624H ONVOY SPECTRUM, LLC 524   2021-11-18   
660-992 4 Blackburn MO KSCZMODR3MD  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.