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: 912

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-912 A Gaithersburg MD   829J PAETEC ITEL, LLC 236   2025-04-02   
240-912 0 Gaithersburg MD   829J PAETEC ITEL, LLC 236      
240-912 1 Gaithersburg MD   829J PAETEC ITEL, LLC 236      
240-912 2 Gaithersburg MD   829J PAETEC ITEL, LLC 236      
240-912 3 Gaithersburg MD   829J PAETEC ITEL, LLC 236      
240-912 4 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-12-12   
240-912 5 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-12-12   
240-912 6 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-12-12   
240-912 7 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-12-12   
240-912 8 Gaithersburg MD   829J PAETEC ITEL, LLC 236      
240-912 9 Gaithersburg MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-12-12   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.