[blowfish721]

Gandi.net seems to support it https://www.yubico.com/works-with-yubikey/catalog/gandi-net/ There’s a short list found here with supported sites including registrars https://www.yubico.com/works-with-yubikey/catalog/

[alfiedotwtf]

When 2FA is not enough... https://fastmail.blog/2014/04/10/when-two-factor-authenticat...

[fckthisguy]

They do, I use it.