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The following servers are configured to support TLS on port 853 and STARTTLS on port 53 for testing purposes.

Open Public resolver

  • Hosted by the getdns API implementation project at (Unbound 1.5.6):

    • IP address: and 2a04:b900:0:100::38
    • Note this server does not support UDP without DNS Cookies (RFC7873)
    • Also note the server does not yet support EDNS0 TCP Keepalive (RFC7828) or out-of-order response processing (RFC7766)