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.

OCN: 820C INTRADO COMMUNICATIONS, LLC

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
443-961 A Baltimore MD BLTMMDCHPMD  238      
443-961 0 Baltimore MD BLTMMDCHPMD  238   2015-02-13   
443-961 9 Baltimore MD BLTMMDCHPMD  238   2015-02-13   
667-771 0 Baltimore MD BLTMMDCHPMD  238   2016-08-20   

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

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