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: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

NXX: 448

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-448 A Waldorf MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-02-23   
240-448 0 Waldorf MD   515J IP HORIZON LLC 236   2016-05-31   
240-448 1 Waldorf MD   876D ONVOY, LLC - MD 236   2016-08-05   
240-448 2 Waldorf MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2014-11-17   
240-448 3 Waldorf MD   318J COMCAST IP PHONE, LLC 236   2014-05-10   
240-448 4 Waldorf MD   876D ONVOY, LLC - MD 236   2016-08-05   
240-448 5 Waldorf MD   318J COMCAST IP PHONE, LLC 236   2015-10-20   
240-448 6 Waldorf MD   876D ONVOY, LLC - MD 236   2016-03-11   
240-448 7 Waldorf MD   876D ONVOY, LLC - MD 236   2016-03-11   
240-448 8 Waldorf MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-10-07   
240-448 9 Waldorf MD   876D ONVOY, LLC - MD 236   2023-10-20   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.