Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 443

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-443 A Arbutus MD BLTQMD013MD  939H COMMIO, LLC 238   2024-01-22   
443-443 0 Arbutus MD   939H COMMIO, LLC 238   2024-01-22   
443-443 1 Arbutus MD   939H COMMIO, LLC 238   2024-01-22   
443-443 2 Arbutus MD   939H COMMIO, LLC 238   2024-01-22   
443-443 3 Arbutus MD   939H COMMIO, LLC 238   2024-01-22   
443-443 4 Arbutus MD   939H COMMIO, LLC 238   2024-01-22   
443-443 5 Arbutus MD   876D ONVOY, LLC - MD 238   2024-03-08   
443-443 6 Arbutus MD   876D ONVOY, LLC - MD 238   2024-04-13   
443-443 7 Arbutus MD   876D ONVOY, LLC - MD 238   2026-01-12   
443-443 8 Arbutus MD   876D ONVOY, LLC - MD 238   2024-07-15   
443-443 9 Arbutus MD   876D ONVOY, LLC - MD 238   2024-07-15   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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