The following contextual IAB categories can be targeted at:
Cars
Hobbies and Interests
Pop culture
Healthy lifestyle
Books and Literature
House and garden
Personal finance
Health
Business and Finance
Art
Travel
Technology
Events and Attractions
Pets
Shopping
TV
Family and Relationships
Food and drinks
Sports
Education
Real estate
Music and Sound
Style and Fashion
Science
Movies
News and Politics
Jobs
Video games