Six months ago, Google delisted all sites on a co.cc domain name. They seem to have all returned today.Google saw a many sites on that subdomain to be “spammy or low-quality” and simply blocked the whole subdomain from showing up in Google’s results.

Whether this is intentional or a bug we dont know.We will see.

Previously (six months ago):

A search for [site:co.cc] currently returns 104,000,000 results.