Research on IUU fishing has identified the importance of ports of convenience as facilitators of IUU fishing activities. These types of ports allow IUU fishing vessels to offload their illegal catch undetected and transfer it via other methods to target destinations and into international markets. No study to date has explained what port characteristics make them attractive to IUU fishing vessels. Applying the risky facilities framework, this study empirically tests ports’ traits that facilitate vessel entry and offloading of illegal catch. A total of 120 ports visited by IUU fishing vessels are studied for measures of regulation of behavior and degree of enforcement activity occurring within their jurisdiction. Additionally, country-level characteristics are examined. Policy recommendations are devised to inform change in place management practices and to discourage IUU fishing activities.