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: 531 [Rate centres in NPA 531] [Dial plan for NPA 531]

NXX: 206

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
531-206 A Ainsworth NE CRRLIAAF0MD  6263 UNITED STATES CELLULAR - NE 644      
531-206 0 Ainsworth NE   6263 UNITED STATES CELLULAR - NE 644   2018-10-25   
531-206 1 Ainsworth NE   478H AIRUS, INC. - NE 644   2019-05-03   
531-206 2 Ainsworth NE   549E ONVOY, LLC - NE 644   2019-09-16   
531-206 3 Ainsworth NE   478H AIRUS, INC. - NE 644   2020-03-01   
531-206 4 Ainsworth NE   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 644   2025-05-23   
531-206 5 Ainsworth NE   549E ONVOY, LLC - NE 644   2020-06-15   
531-206 6 Ainsworth NE   549E ONVOY, LLC - NE 644   2020-10-12   
531-206 7 Ainsworth NE   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 644   2020-05-29   
531-206 8 Ainsworth NE   073H TELNYX LLC 644   2019-09-19   
531-206 9 Ainsworth NE   478H AIRUS, INC. - NE 644   2019-10-31   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.