I found strange address at owner property of my contract. It's not an account. how to check what is located at this address?

Etherscan?

It's local network (ganache)

web3 can do it?

U can write smart contract which can say u the weight of that address (is that contract or wallet)

I am looking for something like https://ethereum.gitbooks.io/frontier-guide/content/interacting_contract.html getContractInfo. But looks loke ganache doesn't support this api by default