Quad9 to Retire DNS-over-HTTPS HTTP/1.1 Support on December 15, 2025
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Summary
Quad9, a free public DNS service focused on security and privacy, announces it will discontinue support for DNS-over-HTTPS (DOH) using HTTP/1.1 on December 15, 2025. The change will primarily affect older or non-compliant devices and software, which will need to revert to unencrypted DNS or switch to DNS-over-TLS. The article explains Quad9's history as the first large-scale resolver to offer standards-based encryption and provides technical background on the retirement of HTTP/1.1 in favor of HTTP/2/3 for improved performance and security.
Key quotes
· 4 pulledQuad9 will be discontinuing support within DNS-over-HTTPS (DOH) using HTTP/1.1 on December 15, 2025.
This should have no impact on most users, but there are some older or non-compliant devices or software which may be unsupported after that time with DOH and which will have to revert to unencrypted DNS or shift to DNS-over-TLS.
Quad9 was the first large-scale recursive resolver to offer standards-based encryption (DNS-over-...)
A public and free DNS service for a better security and privacy
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