This website was last updated in Jan 2021 and is no longer maintained. The ESNI protocol has been deprecated in favour of ECH (Encrypted Client Hello), and there is little technical overlap between ESNI and ECH, even if they share the same intent. We will be working on echcheck.com instead.

We are preserving this website for historical reasons but the information presented here should be considered outdated and incorrect. Additionally, and not surprisingly perhaps, things may not work as expected.