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ICT-Hotlist Topic

DNSCMD (as referenced in my article in

Domain Name Server (DNS) mutations can be performed by scripts using the following command line commands (Windows server 2000 or better) :
  • DNSCMD /recordadd
  • DNSCMD /recorddelete


Adding DNS records

Adding a new DNS A record to access the server named TestServer at IP-Address with the DNS server nlaaldns1:
dnscmd /recordadd TestServer A
Adding the Alias WebServer pointing to the recently created TestServer using CNAME
dnscmd /recordadd WebServer CNAME
Testing the correct configuration with the ping IPv4 command:
c:>ping WebServer -4

Pinging [] with 32 bytes of data:
Reply from bytes=32 time=21ms TTL=126
Reply from bytes=32 time=21ms TTL=126
Reply from bytes=32 time=22ms TTL=126
Reply from bytes=32 time=22ms TTL=126

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 21ms, Maximum = 22ms, Average = 21ms
Notice the ping request shows the original TestServer.

Removing DNS records

Removing the Alias and Host DNS records without asking for confirmation (use in batches):
dnscmd /recorddelete WebServer CNAME /f
dnscmd /recorddelete TestServer A /f

Warning: A Windows domain name can not contain an underscore "_" according to these standards. The underscore is used in these examples as a spam counter measure.

Also read the topic DNS Aliases on File Servers not allowed anymore and a fix for it! To provide increased network security of Windows and Windows Server for the modern landscape, beginning in Windows 11 Insider Preview Build 25381 (Canary, zn_release) Enterprise editions, SMB signing is now required by default for all connections. This will probably brick your old unsupported NAS.
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Scripts and programming examples disclaimer

Unless stated otherwise, the script sources and programming examples provided are copyrighted freeware. You may modify them, as long as a reference to the original code and hyperlink to the source page is included in the modified code and documentation. However, it is not allowed to publish (copies of) scripts and programming examples on your own site, blog, vlog, or distribute them on paper or any other medium, without prior written consent.
Many of the techniques used in these scripts, including but not limited to modifying the registry or system files and settings, impose a risk of rendering the Operating System inoperable and loss of data. Make sure you have verified full backups and the associated restore software available before running any script or programming example. Use these scripts and programming examples entirely at your own risk. All liability claims against the author in relation to material or non-material losses caused by the use, misuse or non-use of the information provided, or the use of incorrect or incomplete information, are excluded. All content is subject to change and provided without obligation.
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