The version of the node running on the entire blockchain can be consulted in PoolTool. I want to check the individual version of a stake pool. Thanks.
I believe PoolTool asks node operators to send them the data.
In bitcoin style nodes there is an RPC
getpeerinfo and that shows peer info like major version, I dont think there is anything for cardano-node yet.
You could try looking thorough cardano-node logs and see if there is version data exchanged (I expect there is), you would then just need to manually configure
mainnet-topology.json to point your node to the pool node.
Bear in mind this will only give the public relay version, not the block producer version.