The TrustedSource report for that IP address merely marks it as Yellow, which is a lesser warning (Red would be a total block for the address).
The same report shows just one associated domain, affiliatitrk.com, which it marks as Red and classes as a Malicious Site with the note "Spam URLs".
You mentioned domains, plural. The IP address shows up on different scans as Rackspace Hosting or as a GoDaddy server (probably GoDaddy), and either way I would expect a number of sites to be hosted on it (but not necessarily resident on it long-term; sites get moved). Possibly a site which got moved elsewhere had a bad reputation, or one or more of the other unnamed sites also gets a Red TrustedSource rating for some reason.
That's about all I can learn except that the IP address does not appear to be blacklisted anywhere, reducing the chances that any site other than the one mentioned has got a problem. I'm assuming that the TrustedSource information is up to date.
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