After we had an interesting discussion about blocking spiders via htaccess I would like to know: How can I find the PBNs of my competitors if he hides it from spiders? One technique I use with some success is to search for the keywords in quotation mark. Because you want to use the PBNs for your strongest links therefore often the exact keywords are used as anchors. By searching for "keyword phrase" and scanning all the serps carefully we can find some PBNs. But I am sure there are more techniques. Any tipps? BTW: I just research for my own interest, to get a better understanding of what works and play the game on a higher level. I dont look for other people´s PBNs to report them.