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.

OCN: 530H WIDE VOICE, LLC - MD

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
227-222 A Washington Zone 16 MD WASHDCSWFMD  236      
227-222 2 Washington Zone 16 MD WASHDCSWFMD  236   2023-12-18   
227-368 A Mechanicsville MD WASHDCSWFMD  236      
227-368 6 Mechanicsville MD WASHDCSWFMD  236   2023-10-21   
227-777 A Ashton (Baltimore LATA) MD BLTMMDCHYMD  238      
227-777 7 Ashton (Baltimore LATA) MD BLTMMDCHYMD  238   2023-09-30   
227-888 A Washington Zone 15 (Baltimore LATA) MD BLTMMDCHYMD  238      
227-888 8 Washington Zone 15 (Baltimore LATA) MD BLTMMDCHYMD  238   2023-11-20   
227-999 A Washington Zone 10 MD WASHDCSWFMD  236      
227-999 9 Washington Zone 10 MD WASHDCSWFMD  236   2023-12-15   
667-771 A Baltimore MD BLTMMDCHYMD  238      
667-771 1 Baltimore MD BLTMMDCHYMD  238   2016-02-04   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.