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 getdnsapi.net (Unbound 1.5.6):
- IP address: 220.127.116.11 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)