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The following servers are configured to support TLS on port 1021 and STARTTLS on port 53 for testing purposes.

Open resolver


Authoritative servers

  • The authoritative servers for are running a patched version of NSD:
    • IP address: and 2a04:b900:0:100::37
    • The server key file is available for download here:

Authoritative test server hosted by Verisign Labs: