Problem is the blockchain stuff usually ends up being computationally expensive for what it's trying to do. I could maybe see a use case for DNS but then eithe

Problem is the blockchain stuff usually ends up being computationally expensive for what it's trying to do. I could maybe see a use case for DNS but then either each computer has to have the full blockchain locally or rely on providers to do that for them in which case we're basically at the same model we have now (with root servers and DNS servers). Obviously you don't want to publish private IPs, etc. to other computers... so inside a local network you're not buying yourself much. For routing tables I could see more of a use case for blockchain technology since you can actually verify the routing tables and prevent BGP spoofing, etc.