the clearest sign of a hidden pbn is when a site ranks high in google but has weak backlinks in seo tools compared to other sites in the serp. for example, if most domains on page one have dr 40-60, and one competitor has dr 10, that’s a red flag.
with hidden pbns, access to the backlink domains is blocked at the server level, so tools like ahrefs, semrush, and majestic won’t see those links. those crawlers are usually blocked first.
so here’s the first method: try using less popular seo tools like spyfu, mangools, ubersuggest, serpstat. you can also try publicwww to dig deeper.
the second method is slower but sometimes works—search in google using queries like “domain.com” or just the brand name in quotes, along with main keywords. with some luck, you might spot domains that are linking to your competitor