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Detect if an IP address is running a Bitcoin node

Is there a way to detect if an IP address is running a Bitcoin node? Maybe I can extract the IP information from the blockchain somehow?

Solution

  • There are many ways to do this.

    Pretty reliable and relatively simple way is to get the list of Bitcoin nodes from https://api.blockchair.com/bitcoin/nodes. It is the JSON object that looks like:

    {"data":{"nodes":{"1.234.63.142:8333":"version":"\/Satoshi:0.16.0\/","country":"KR","height":588031,"flags":1037},
"1.36.226.179:8333":{"version":"\/Satoshi:0.18.0\/","country":"HK","height":588031,"flags":1037},
"100.12.85.110:8333":{"version":"\/Satoshi:0.16.2\/","country":"US","height":588031,"flags":1037},
...

    And then check if IP address in question is present in this list.