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: 329

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-329 A Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
301-329 0 Ashton (Baltimore LATA) MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
301-329 1 Ashton (Baltimore LATA) MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
301-329 2 Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-07   
301-329 3 Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-02   
301-329 4 Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-05   
301-329 5 Ashton (Baltimore LATA) MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-24   
301-329 6 Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-10-04   
301-329 7 Ashton (Baltimore LATA) MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
301-329 8 Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-05   
301-329 9 Ashton (Baltimore LATA) MD BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-05   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.