[dredmorbius]

Another set is Yandex, a Chinese [Edit: Nope, Russian, see below] web crawler. I've done a basic "what CIDRs and ASNs were involved" in a top-level post.

These idiots can't tell Web crawler traffic from DDoS (though often there's little practical difference).

[bx_]

https://company.yandex.com/

Yanex is Russia's Google.

[dredmorbius]

Derp. I was thinking of Baidu. Knew it was search at least, from logs.