The first step in the process is to reverse the offending IP address. This might include nameservers, email servers, as well as the host' resolved name. This can be somewhat of a tricky operation. Use the resolved name above to try to determine what country or region the IP address might be based in, and then be sure to use the proper whois gateway for that region of the world. There are dozens of others, but most addresses should be registered in one of the above online centralized databases.
Whois databases can contain outdated information.
You may want to then research your IP with the country specific whois database to determine the correct registered owner. Note that many administrators block ICMP traffic, so this is not conclusive evidence either way. Traceroute may help you in two ways. If your IP does not resolve it may give you a clue as to its parentage. Look at the resolved host just before your target, this host' name may be the upstream provider for the attacking host, and thus a point of contact, or they may in fact have the same domain as your attacking host, although that is not always true.