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: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX: 857

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-857 A Clear Spring MD HGTWMD53DS0  2593 CORE COMMUNICATIONS, INC.- MD 240      
301-857 0 Clear Spring MD FRDRMDFRPS0  2593 CORE COMMUNICATIONS, INC.- MD 240      
301-857 1 Clear Spring MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-857 2 Clear Spring MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-857 3 Clear Spring MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-857 4 Clear Spring MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
301-857 5 Clear Spring MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
301-857 6 Clear Spring MD FRDRMDFRXKX  508J CENTURYLINK COMMUNICATIONS, LLC 240      
301-857 7 Clear Spring MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-857 8 Clear Spring MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      
301-857 9 Clear Spring MD HGTWMDHGDMD  071F BANDWIDTH.COM CLEC, LLC - MD 240      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.