A PBN is built by registering 10–50+ expired domains that have existing authority and clean backlink histories, then populating them with content that links to your main site. You'd host each domain on different IP addresses (different C-blocks ideally), use varied registrars, different WordPress themes, and unique content to avoid footprints that search engines can detect. The theory is these "aged" domains pass link equity without the effort of outreach. The technical steps: Source domains through auction sites like GoDaddy Auctions or NameJet, check their history in Ahrefs or Wayback Machine for spam or adult content, register with privacy protection, set up hosting across multiple providers (costs add up fast—expect $15–30 per domain annually), install WordPress with different themes, and publish 5–15 articles per site before adding money-site links. The reality is PBNs are explicitly against Google's Webmaster Guidelines. If detected, your entire network and the sites you're linking to can be deindexed or hit with manual penalties. Google has become extremely effective at identifying PBN footprints—shared hosting patterns, similar WHOIS data, thin content, unnatural anchor text distribution. One algorithmic update or manual review can wipe out months of investment. At Ottawa SEO, we don't build or recommend PBNs for clients. The risk-reward ratio doesn't justify it when white-hat strategies—guest posting on real sites, digital PR, creating linkable assets, HARO, unlinked mentions—deliver sustainable results without the existential threat to your online presence. We've seen competitors lose rankings overnight when their PBNs got burned. If you already run a legitimate portfolio of real websites (like our 500+ domains serving actual content), internal linking within that ecosystem is perfectly legitimate. The difference is intent and value—real sites serve users, PBNs exist solely to manipulate rankings. The line is clear in practice: if the only reason a site exists is to pass PageRank, it's a PBN and carries all the associated risk.