Host tracker operate out of The Planet
I dont know anything about them, but their ip is listed as 67.18.217.22
http://www.ip-adress.com/reverse_ip/host-tracker.com
http://whois.domaintools.com/67.18.217.22
Hyperspin also work out of The Planet
http://www.hyperspin.com/en/
Ip 174.132.46.210
http://www.ip-adress.com/reverse_ip/hyperspin.com
http://whois.domaintools.com/174.132.46.210
I dont use either of the services, so have no idea of the user agents