I have the similar problem... Several thousand requests from two ours /20 networks..., from our clients, about 50IP's. The list of domains (with auto-generated subdomains): betboy.cc, 365ddos.cn, dytt8.net, pddos.com, sheshows.com, cp375.com, sdjlh.com, asxkmy.com, ytwtoys.com, jimdo.com, ftes.info, gx911.com... At this moment :-) I also filter them using iptables ... Other options I do not see.
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