Finding only the ip won;t help coz the ips points to some isp provider let;s say comcast/mercantile/bla bla ...  and it;s almost impossible to trace particular home location coz they don;t allow you to give their personal information but they can be forced to take action or opt out the email address if you send abuse email to the tech support of the corresponding mail domain.

If that doesn't help, every ip is associated with ASN, get the whois information on ARIN/APNIC[IP registry for America/Asia] and get the abuse email contact and directly email them.

as i have already replied back how to trace domain or ip lookup via whois:

Good Day!!!!