Advice and answers from the Ahrefs Team

Our system is wired to identify spammy subdomains early in, so they don’t even get into our database in the first place.

For example, in case a website has tons of subdomains, we will only download the top part of the list and stop as soon as the quality drops beyond a certain threshold.

So basically, we don’t need to clean our database from spammy networks because we don’t even index them in the beginning.

Did this answer your question?