isprime is hosting credit card scammers of the biggest porn network scammers in the world. They are hosting scammers like sobvsites, studpay, gaypay, gaygravy, gfprofits, nichecastle, archivecash, skintraffic, trannypay and lots of other scammers. When a surfer is buying a membership to their porn sites, the credit card will be charged again and again and again... They are scammers. You should read the article on gaydemon.biz. This means isprime is hosting lots of scammers. If you want to do scam related activities, you should use them to host your stuff.
Currently, the nameservers of isprime.com pointing to ns1. and ns2.nationalnet.com
For example: http://www.bearbfs.com.webmasterworlds.com/ - This is a good example of that credit card scam network for popular very good advertised scam porn sites.
You should also be aware of those hosting networks: http://dnstree.com/com/pornpros/. It is the hosting network of those credit card scammers. All porn related scams.
@ MrNerd: You have no idea! They are scammers. Try out one of there free or $1 offers and your credit card will be charged again and again for a bulk set of their porn sites until you ban your credit card.