2-17-15 12:45 am, IP 84.72.142.174. Traces to Wohlen, Switzerland. Of course, IPs can be spoofed. While looking up that IP, I came across an interesting anti-spammer/harvester/attacker project:
https://www.projecthoneypot.org/faq.php
Also, you can check an IP address to see what kind of "record" it has:
https://www.projecthoneypot.org/search_ip.php