Already done but no response or actions. I never seen my my life so big amount of spam servers in 1 subnet. I bet that Server Hub knows about it but like many hosting providers they don't care as spammers are paid customer.
It is not uncommon for such sites to be resellers of resellers. Such sites often disregard reports unless the activity would be enough for them to lose their uplinks. It's probably best to just block or tarpit all the CIDR blocks in their ASN and move on.
