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: WASHDCSWDS8

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-746 A Brandywine MD 7421 AT&T - LOCAL 236      
240-746 9 Brandywine MD 7421 AT&T - LOCAL 236   2021-02-04   
301-825 A Washington Zone 10 MD 7421 AT&T - LOCAL 236      
301-825 0 Washington Zone 10 MD 7421 AT&T - LOCAL 236      

Last updated: Sat, 01 Jun 2024 11:59:14 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.