We are not sure if it happens to all; but it is happening with us. We are getting some spam trackbacks from non-existing URLs!
Below is an example of such spam from a non-existing url:
Frankly, we have no idea about the motive of this kind of spams. The I.P. address are varied and so are the URLs.
Is keyword dilution is the target of these type of spam or the domain will be hosted soon? Wow! Spammers now have started pre-launch spams!