Define the network by what it does
PBN means private blog network, an industry term for a controlled group of sites used to create links that look editorially independent. Google does not need a special PBN label for this. Links created primarily to manipulate rankings fall under its link-spam policy.
Expired domains, generic articles, shared templates, and concealed ownership often appear in these networks, but no single visual clue proves common control or harmful effect. The acquisition record is stronger evidence.
Investigate provenance before metrics
Review past SEO contracts, placement spreadsheets, invoices, email, anchor-text plans, and the dates links first appeared. Look for repeated sellers, hosting or analytics identifiers, shared authors, coordinated publishing, and links aimed at the same money pages with planned anchors.
A low authority score, irrelevant article, or expired certificate can make a site undesirable without proving that it belongs to a PBN. Conversely, a well-designed site can still be controlled placement inventory.
Choose the response from the evidence
Stop any controlled acquisition first. If a Search Console manual action names unnatural links, document removal efforts and consider a carefully scoped disavow file for links that cannot be removed. If there is no action, Google's own guidance says most sites do not need to disavow.
Do not send threatening removal emails to ordinary sites merely because a tool colored them red. That spends goodwill and creates no evidence that rankings will improve.
Replace the acquisition system, not just the URLs
A deleted network can be replaced by another network next month if the incentive and approval process stay intact. Change how links are commissioned, what disclosures and link attributes paid work requires, who can approve placements, and what evidence qualifies an opportunity.
Then build reasons for unaffiliated sites to cite the business: data, useful products, reporting, documentation, tools, or real relationships. That is slower than purchasing the appearance of consensus because it creates the thing the network was imitating.