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.

Marked Tree, AR

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
870-358 A MRTRARXADS0  1722 E. RITTER TEL. CO. 528      
870-375 A LTRKARFR06Z  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 528      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.