Intellectual property lawyers guarding corporate trademarks on the Internet may soon have a harder time tracking down the people behind Web sites infringing on their clients’ brands.

An organization that polices the domain name system is likely to decide this year — after several years of debate — to adopt a new policy that would let Web site owners keep most of their contact information confidential when they register for a name. Instead, they would be allowed to list a separate go-between point of contact.