I spoke with a techie at the controlling network for that IP address yesterday morning. I submitted an abuse report with the pertinent information. He informed me that yes, in fact, that was one of their IP addresses. In a colocation facility in China.

Regardless, the administrator of that server had 24 hours to fix the problem or their ethernet cable would get yanked.

That's about the best I could do. We'll see if I ever hear back from 'em.