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.

Baltimore, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
667-930 7 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2016-11-05   
667-930 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2016-11-05   
667-930 9 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2016-11-05   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.