Silent Push looks at the dynamic DNS market that rents subdomains to cybercrime groups.
Currently, the company says it tracked more than 70,000 domains that are used to rent out subdomains for this type of activity.

Silent Push Examines the Dark Side of Dynamic DNS Providers
Silent Push created a set of reports tracking 70,000+ domains to enable organizations better monitor potentially malicious host connections.

Silent Push (www.silentpush.com)