Hard to know if addresses belong to a single individual or not. I mean, I can have different addresses with different balances. Would you be able to guess which is mine? You will if I told you. but the top addresses would belong to exchanges/gambling sites/other large services in the bitcoin economy, and that is pretty obvious.
There are some well known addresses with giant balances that belong to certain exchanges. However, it's impossible to know whether the rest of them belong to a single individual or not. Some have giant balances but the coins haven't moved in years, so people speculate the owner(s) might have lost the private key, and we might never find out who they belong to.
Block explorers often store IP addresses associated with each Bitcoin address, but that information's not available for very old addresses that haven't had any recent transactions. In addition, some addresses only have Tor IP addresses associated with them, so there's no way to find out who they belong to using IP data.