The Internet Corporation for Assigned Names and Numbers (ICANN) was created in 1998 to perform technical coordination of the Internet. ICANN also lays the foundations for governance, creating capabilities for promulgating and enforcing global regulations on Internet use. ICANN leverages the capabilities in the Internet domain name system (DNS) to implement four mechanisms of governance: authority, law, sanctions, and jurisdictions. These governance-related features are embodied in seemingly technical features of ICANN's institutional design. Recognition of ICANN's governance mechanisms allows us to better understand the Internet's emerging regulatory regime.