I don't know of any either, but there are plenty running PowerDNS in online 'white lies' signing mode. And then, of course, there is Cloudflare. (And indeed, i

I don't know of any either, but there are plenty running PowerDNS in online 'white lies' signing mode. And then, of course, there is Cloudflare. (And indeed, it cannot be done offline - although doing much narrower NSEC/NSEC3 ranges than 'normal' could be done offline).