RE: Are you saying
Not that I'm aware of. If you take a gander at places like afraid.org (who offers free DNS hosting) you'll see there are many publicly available domains with which to create a subdomain with. I have had some run-ins with botnets that relied on IRC command channels using domains from that site. One variant used the subdomain "icp.chickenkiller.com" which has since been directed to 127.0.0.1 for obvious reasons. Another instance used the subdomain "irc.mouse-hole.com" which is still pointed to 69.39.227.123, an old (prior to them being raided) FOONet IP address.
That being said, it looks like at least one dynamic DNS hosting site is trying to do something to combat bot herders using their services.