PBNs are private blog networks that are created by link builders for the sole purpose of building links to other websites. While this can be effective for a short period of time, it is not an ethical or legal way to build search engine rankings. Resource : https://saketwahi.com/pbn-links/
What PBN means?
One of the biggest red flags to look for when evaluating the quality of a PBN is whether or not the sites are relevant. This is because relevancy plays a big role in determining how high a site will rank on Google, and if the website doesn’t have a good niche, it’s unlikely that you’ll get the results you want.
Another thing to watch out for when examining the backlinks of a PBN is how many domains point to it. If it’s too many, then it might be a sign that the site is low quality.
There are also a few things that can help you determine the quality of a PBN, including the content on the site and the number of broken links. These factors will help you avoid a PBN that isn’t worth the money you’re paying for it.
If you are unsure of the PBN that you are buying from, you should ask for proof of their link profile. This can be done through SEO tools such as AHREFS or SEMrush.
Another great tool to use for this is Hozchecker. It will help you determine the hosting environment of a PBN so that you can know if it is a legit site or not.