Spammers routinely register their sites under false names, or hijack someone else’s identity to do so. But new research shows they’re also paying for premium services when registering domain names to ensure a deeper level of anonymity. Data collected by Knujon, an anti-spam outfit that tries to convince registrars to deep-six spam sites, shows that spammers are increasingly registering sites through a handful of domain privacy services that refuse to provide a direct method to contact domain holders. These services are offered by many Web site name registrars, which allow customers to hide their name and address from the global, publicly-searchable “WHOIS” directory of domain name holders. Most domain privacy protection services provide at least a custom e-mail address linked to each domain, so that correspondence with the domain holder can be passed along through the registrar. But spammers are increasingly flocking to a handful of domain privacy services that