I need to find this IP to buy things, how to contact him http://172.104.97.62

I pinged the node and was able to get a response so it is on, but the url http://172.104.97.62 comes up with not found which means that the web server is not setup properly.

Pinging 172.104.97.62 with 32 bytes of data:
Reply from 172.104.97.62: bytes=32 time=156ms TTL=48
Reply from 172.104.97.62: bytes=32 time=145ms TTL=48
Reply from 172.104.97.62: bytes=32 time=147ms TTL=48
Reply from 172.104.97.62: bytes=32 time=148ms TTL=48

Ping statistics for 172.104.97.62:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 145ms, Maximum = 156ms, Average = 149ms

http://172.104.97.62/api/view?token=m1OUyzx4VktUN3PNn01HNnx1JuGz5fkj&number=2408976596

For obvious reasons, Linode doesn't give you the contact information of their customers.

Thank you

From the link you provided, I get the following error message.

{"retcode":0,"errmsg":"","data":{"number":"2408976596","msg":"","lastTime":"2018-11-25 12:59:14","msgCnt":3}}