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.

Washington Zone 13, MD

<< 1 2 3 4 5 6 7 8 9 10 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-901 6 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-901 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-901 8   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-901 9 CLPKMDBWDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 A BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 0 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-902 1 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 2 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 3 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 4 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-902 5 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-11-08   
301-902 6   624H ONVOY SPECTRUM, LLC 236   2021-11-08   
301-902 7 ARTNVAARXDY  318J COMCAST IP PHONE LLC 236   2019-07-05   
301-902 8 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-902 9 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-923 A WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
301-923 0   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-923 1   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-923 2 WASHDCSWFMD  2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-923 3 WASHDCSWFMD  2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-923 4 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-10-17   
301-923 5 BTVLMD127MD  5562 METROPCS, INC. 236   2020-10-05   
301-923 6 WASHDCSWFMD  2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-923 7 WASHDCSWFMD  2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-29   
301-923 8   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-923 9 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-10-17   
301-931 A BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 0 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 1 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 2 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 3 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 4 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 5 HRNDVACKBMD  5977 BROADVIEW NETWORKS, INC. - DC 236   2014-06-09   
301-931 6 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 7 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 8 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-931 9 BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 A HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 0 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 1   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-935 2   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-935 3   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-935 4 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 5 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 6 HYVLMDRIDS0  9212 VERIZON MARYLAND, INC. 236      
301-935 7   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-935 8   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-935 9   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-23   
301-937 A BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-939 A LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      

<< 1 2 3 4 5 6 7 8 9 10 >>

Last updated: Sat, 03 Sep 2022 02:15:35 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.