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.

Switch: SFLDMIMKCMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-552 A Detroit Zone 1 MI 321J HD CARRIER LLC 340      
313-552 9 Detroit Zone 1 MI 321J HD CARRIER LLC 340      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.