The World Wide Web had a major growth spurt Wednesday—in ways not seen since it was created—and that means brand owners may have to spend more energy, time and money to protect their trademarks.

The Internet Corporation for Assigned Names and Numbers (ICANN) is beginning to roll out a series of about 100 new generic top-level domains (gTLDs)—such as .clothing, .singles and .camera—that will join the roughly 110 million Web addresses that end in .com. Over the next few months the nonprofit that governs the Internet will debut many more gTLDs, including .art, .club, .tattoo and .sexy.