How to find a person in Holland from a phone number?

Hi everyone, I met this amazing guy from Holland, I got his phone number but unfortunately I did not got furthermore information about him. I know that his phone number begins with +31, which I think is the international country code, the next digit is 6, and I will keep the last 8 digits secret. Does anyone no how to find a person from Holland by his phone number? I really need your help! ;)