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: 571 [Rate centres in NPA 571] [Dial plan for NPA 571]

NXX: 782

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
571-782 A Herndon VA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-10-16   
571-782 7 Herndon VA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-10-16   
571-782 8 Herndon VA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-10-16   
571-782 9 Herndon VA   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-10-16   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.