Browser Support for RFC9460 HTTPS DNS Records Remains Inconsistent in 2025
By
zdw
Pulled from the oven just right. Trustworthy, fact-dense, deeply satisfying.
Summary
The article discusses the current state of browser support for RFC9460 HTTPS Resource Records (HTTPS RRs) as of December 2025. Despite being published in November 2023, support for these DNS records remains inconsistent across browsers. The RFC defines various SvcParamKeys that browsers support to different degrees, and there's disagreement among developers about proper implementation. The article notes that even caniuse.com doesn't provide comprehensive information about which browsers support these records and to what extent, leaving developers without a clear picture of the current support landscape.
Key quotes
· 3 pulledRFC9460, defining SVCB and HTTPS Resource Records, was published in November of 2023. Two years later, however, support for these DNS records is still far from universal.
Add to that the fact that the RFC defines a number of SvcParamKeys, which browsers support to different degrees and where developers disagree about the proper behavior, and you end up with no clear picture of which browsers support these records to which end.
Unfortunately even the otherwise ever so useful https://caniuse.com/ does not provide that information, although there's a feature
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