Reference

All IAB categories

The complete IAB category list used in programmatic advertising: 392 IAB content categories, from IAB1 to IAB26. Search a code or a name, or filter by group.

IAB categories describe the subject of a site, app, or video so buyers can target or block it. This table is the full IAB Content Taxonomy 1.0 list. Those are the IAB1-style codes OpenRTB still carries in cat and bcat.

A tier-1 code such as IAB1 is a broad group. A tier-2 code such as IAB1-5 is one topic inside that group. Blocking the group blocks every topic under it. Blocking one topic leaves the rest of the group eligible.

IAB Tech Lab now recommends Content Taxonomy 3.1 for new content categorization. That version uses numeric IDs and is much larger. Most exchanges, wrappers, and blocklists still speak the 1.0 codes below, which is why this page lists all IAB categories in that set. Names follow the OpenRTB content-category list. See also IAB categories in the glossary and OpenRTB.

392 IAB categories

All IAB categories — Content Taxonomy 1.0 (IAB1 through IAB26)
IAB code	Tier	Category	Group
`IAB1`	Tier 1	Arts & Entertainment	Arts & Entertainment
`IAB1-1`	Tier 2	Books & Literature	Arts & Entertainment
`IAB1-2`	Tier 2	Celebrity Fan/Gossip	Arts & Entertainment
`IAB1-3`	Tier 2	Fine Art	Arts & Entertainment
`IAB1-4`	Tier 2	Humor	Arts & Entertainment
`IAB1-5`	Tier 2	Movies	Arts & Entertainment
`IAB1-6`	Tier 2	Music	Arts & Entertainment
`IAB1-7`	Tier 2	Television	Arts & Entertainment
`IAB2`	Tier 1	Automotive	Automotive
`IAB2-1`	Tier 2	Auto Parts	Automotive
`IAB2-2`	Tier 2	Auto Repair	Automotive
`IAB2-3`	Tier 2	Buying/Selling Cars	Automotive
`IAB2-4`	Tier 2	Car Culture	Automotive
`IAB2-5`	Tier 2	Certified Pre-Owned	Automotive
`IAB2-6`	Tier 2	Convertible	Automotive
`IAB2-7`	Tier 2	Coupe	Automotive
`IAB2-8`	Tier 2	Crossover	Automotive
`IAB2-9`	Tier 2	Diesel	Automotive
`IAB2-10`	Tier 2	Electric Vehicle	Automotive
`IAB2-11`	Tier 2	Hatchback	Automotive
`IAB2-12`	Tier 2	Hybrid	Automotive
`IAB2-13`	Tier 2	Luxury	Automotive
`IAB2-14`	Tier 2	Minivan	Automotive
`IAB2-15`	Tier 2	Motorcycles	Automotive
`IAB2-16`	Tier 2	Off-Road Vehicles	Automotive
`IAB2-17`	Tier 2	Performance Vehicles	Automotive
`IAB2-18`	Tier 2	Pickup	Automotive
`IAB2-19`	Tier 2	Road-Side Assistance	Automotive
`IAB2-20`	Tier 2	Sedan	Automotive
`IAB2-21`	Tier 2	Trucks & Accessories	Automotive
`IAB2-22`	Tier 2	Vintage Cars	Automotive
`IAB2-23`	Tier 2	Wagon	Automotive
`IAB3`	Tier 1	Business	Business
`IAB3-1`	Tier 2	Advertising	Business
`IAB3-2`	Tier 2	Agriculture	Business
`IAB3-3`	Tier 2	Biotech/Biomedical	Business
`IAB3-4`	Tier 2	Business Software	Business
`IAB3-5`	Tier 2	Construction	Business
`IAB3-6`	Tier 2	Forestry	Business
`IAB3-7`	Tier 2	Government	Business
`IAB3-8`	Tier 2	Green Solutions	Business
`IAB3-9`	Tier 2	Human Resources	Business
`IAB3-10`	Tier 2	Logistics	Business
`IAB3-11`	Tier 2	Marketing	Business
`IAB3-12`	Tier 2	Metals	Business
`IAB4`	Tier 1	Careers	Careers
`IAB4-1`	Tier 2	Career Planning	Careers
`IAB4-2`	Tier 2	College	Careers
`IAB4-3`	Tier 2	Financial Aid	Careers
`IAB4-4`	Tier 2	Job Fairs	Careers
`IAB4-5`	Tier 2	Job Search	Careers
`IAB4-6`	Tier 2	Resume Writing/Advice	Careers
`IAB4-7`	Tier 2	Nursing	Careers
`IAB4-8`	Tier 2	Scholarships	Careers
`IAB4-9`	Tier 2	Telecommuting	Careers
`IAB4-10`	Tier 2	U.S. Military	Careers
`IAB4-11`	Tier 2	Career Advice	Careers
`IAB5`	Tier 1	Education	Education
`IAB5-1`	Tier 2	7-12 Education	Education
`IAB5-2`	Tier 2	Adult Education	Education
`IAB5-3`	Tier 2	Art History	Education
`IAB5-4`	Tier 2	College Administration	Education
`IAB5-5`	Tier 2	College Life	Education
`IAB5-6`	Tier 2	Distance Learning	Education
`IAB5-7`	Tier 2	English as a 2nd Language	Education
`IAB5-8`	Tier 2	Language Learning	Education
`IAB5-9`	Tier 2	Graduate School	Education
`IAB5-10`	Tier 2	Homeschooling	Education
`IAB5-11`	Tier 2	Homework/Study Tips	Education
`IAB5-12`	Tier 2	K-6 Educators	Education
`IAB5-13`	Tier 2	Private School	Education
`IAB5-14`	Tier 2	Special Education	Education
`IAB5-15`	Tier 2	Studying Business	Education
`IAB6`	Tier 1	Family & Parenting	Family & Parenting
`IAB6-1`	Tier 2	Adoption	Family & Parenting
`IAB6-2`	Tier 2	Babies & Toddlers	Family & Parenting
`IAB6-3`	Tier 2	Daycare/Pre School	Family & Parenting
`IAB6-4`	Tier 2	Family Internet	Family & Parenting
`IAB6-5`	Tier 2	Parenting - K-6 Kids	Family & Parenting
`IAB6-6`	Tier 2	Parenting teens	Family & Parenting
`IAB6-7`	Tier 2	Pregnancy	Family & Parenting
`IAB6-8`	Tier 2	Special Needs Kids	Family & Parenting
`IAB6-9`	Tier 2	Eldercare	Family & Parenting
`IAB7`	Tier 1	Health & Fitness	Health & Fitness
`IAB7-1`	Tier 2	Exercise	Health & Fitness
`IAB7-2`	Tier 2	A.D.D.	Health & Fitness
`IAB7-3`	Tier 2	AIDS/HIV	Health & Fitness
`IAB7-4`	Tier 2	Allergies	Health & Fitness
`IAB7-5`	Tier 2	Alternative Medicine	Health & Fitness
`IAB7-6`	Tier 2	Arthritis	Health & Fitness
`IAB7-7`	Tier 2	Asthma	Health & Fitness
`IAB7-8`	Tier 2	Autism/PDD	Health & Fitness
`IAB7-9`	Tier 2	Bipolar Disorder	Health & Fitness
`IAB7-10`	Tier 2	Brain Tumor	Health & Fitness
`IAB7-11`	Tier 2	Cancer	Health & Fitness
`IAB7-12`	Tier 2	Cholesterol	Health & Fitness
`IAB7-13`	Tier 2	Chronic Fatigue Syndrome	Health & Fitness
`IAB7-14`	Tier 2	Chronic Pain	Health & Fitness
`IAB7-15`	Tier 2	Cold & Flu	Health & Fitness
`IAB7-16`	Tier 2	Deafness	Health & Fitness
`IAB7-17`	Tier 2	Dental Care	Health & Fitness
`IAB7-18`	Tier 2	Depression	Health & Fitness
`IAB7-19`	Tier 2	Dermatology	Health & Fitness
`IAB7-20`	Tier 2	Diabetes	Health & Fitness
`IAB7-21`	Tier 2	Epilepsy	Health & Fitness
`IAB7-22`	Tier 2	GERD/Acid Reflux	Health & Fitness
`IAB7-23`	Tier 2	Headaches/Migraines	Health & Fitness
`IAB7-24`	Tier 2	Heart Disease	Health & Fitness
`IAB7-25`	Tier 2	Herbs for Health	Health & Fitness
`IAB7-26`	Tier 2	Holistic Healing	Health & Fitness
`IAB7-27`	Tier 2	IBS/Crohn's Disease	Health & Fitness
`IAB7-28`	Tier 2	Incest/Abuse Support	Health & Fitness
`IAB7-29`	Tier 2	Incontinence	Health & Fitness
`IAB7-30`	Tier 2	Infertility	Health & Fitness
`IAB7-31`	Tier 2	Men's Health	Health & Fitness
`IAB7-32`	Tier 2	Nutrition	Health & Fitness
`IAB7-33`	Tier 2	Orthopedics	Health & Fitness
`IAB7-34`	Tier 2	Panic/Anxiety Disorders	Health & Fitness
`IAB7-35`	Tier 2	Pediatrics	Health & Fitness
`IAB7-36`	Tier 2	Physical Therapy	Health & Fitness
`IAB7-37`	Tier 2	Psychology/Psychiatry	Health & Fitness
`IAB7-38`	Tier 2	Senior Health	Health & Fitness
`IAB7-39`	Tier 2	Sexuality	Health & Fitness
`IAB7-40`	Tier 2	Sleep Disorders	Health & Fitness
`IAB7-41`	Tier 2	Smoking Cessation	Health & Fitness
`IAB7-42`	Tier 2	Substance Abuse	Health & Fitness
`IAB7-43`	Tier 2	Thyroid Disease	Health & Fitness
`IAB7-44`	Tier 2	Weight Loss	Health & Fitness
`IAB7-45`	Tier 2	Women's Health	Health & Fitness
`IAB8`	Tier 1	Food & Drink	Food & Drink
`IAB8-1`	Tier 2	American Cuisine	Food & Drink
`IAB8-2`	Tier 2	Barbecues & Grilling	Food & Drink
`IAB8-3`	Tier 2	Cajun/Creole	Food & Drink
`IAB8-4`	Tier 2	Chinese Cuisine	Food & Drink
`IAB8-5`	Tier 2	Cocktails/Beer	Food & Drink
`IAB8-6`	Tier 2	Coffee/Tea	Food & Drink
`IAB8-7`	Tier 2	Cuisine-Specific	Food & Drink
`IAB8-8`	Tier 2	Desserts & Baking	Food & Drink
`IAB8-9`	Tier 2	Dining Out	Food & Drink
`IAB8-10`	Tier 2	Food Allergies	Food & Drink
`IAB8-11`	Tier 2	French Cuisine	Food & Drink
`IAB8-12`	Tier 2	Health/Lowfat Cooking	Food & Drink
`IAB8-13`	Tier 2	Italian Cuisine	Food & Drink
`IAB8-14`	Tier 2	Japanese Cuisine	Food & Drink
`IAB8-15`	Tier 2	Mexican Cuisine	Food & Drink
`IAB8-16`	Tier 2	Vegan	Food & Drink
`IAB8-17`	Tier 2	Vegetarian	Food & Drink
`IAB8-18`	Tier 2	Wine	Food & Drink
`IAB9`	Tier 1	Hobbies & Interests	Hobbies & Interests
`IAB9-1`	Tier 2	Art/Technology	Hobbies & Interests
`IAB9-2`	Tier 2	Arts & Crafts	Hobbies & Interests
`IAB9-3`	Tier 2	Beadwork	Hobbies & Interests
`IAB9-4`	Tier 2	Birdwatching	Hobbies & Interests
`IAB9-5`	Tier 2	Board Games/Puzzles	Hobbies & Interests
`IAB9-6`	Tier 2	Candle & Soap Making	Hobbies & Interests
`IAB9-7`	Tier 2	Card Games	Hobbies & Interests
`IAB9-8`	Tier 2	Chess	Hobbies & Interests
`IAB9-9`	Tier 2	Cigars	Hobbies & Interests
`IAB9-10`	Tier 2	Collecting	Hobbies & Interests
`IAB9-11`	Tier 2	Comic Books	Hobbies & Interests
`IAB9-12`	Tier 2	Drawing/Sketching	Hobbies & Interests
`IAB9-13`	Tier 2	Freelance Writing	Hobbies & Interests
`IAB9-14`	Tier 2	Genealogy	Hobbies & Interests
`IAB9-15`	Tier 2	Getting Published	Hobbies & Interests
`IAB9-16`	Tier 2	Guitar	Hobbies & Interests
`IAB9-17`	Tier 2	Home Recording	Hobbies & Interests
`IAB9-18`	Tier 2	Investors & Patents	Hobbies & Interests
`IAB9-19`	Tier 2	Jewelry Making	Hobbies & Interests
`IAB9-20`	Tier 2	Magic & Illusion	Hobbies & Interests
`IAB9-21`	Tier 2	Needlework	Hobbies & Interests
`IAB9-22`	Tier 2	Painting	Hobbies & Interests
`IAB9-23`	Tier 2	Photography	Hobbies & Interests
`IAB9-24`	Tier 2	Radio	Hobbies & Interests
`IAB9-25`	Tier 2	Roleplaying Games	Hobbies & Interests
`IAB9-26`	Tier 2	Sci-Fi & Fantasy	Hobbies & Interests
`IAB9-27`	Tier 2	Scrapbooking	Hobbies & Interests
`IAB9-28`	Tier 2	Screenwriting	Hobbies & Interests
`IAB9-29`	Tier 2	Stamps & Coins	Hobbies & Interests
`IAB9-30`	Tier 2	Video & Computer Games	Hobbies & Interests
`IAB9-31`	Tier 2	Woodworking	Hobbies & Interests
`IAB10`	Tier 1	Home & Garden	Home & Garden
`IAB10-1`	Tier 2	Appliances	Home & Garden
`IAB10-2`	Tier 2	Entertaining	Home & Garden
`IAB10-3`	Tier 2	Environmental Safety	Home & Garden
`IAB10-4`	Tier 2	Gardening	Home & Garden
`IAB10-5`	Tier 2	Home Repair	Home & Garden
`IAB10-6`	Tier 2	Home Theater	Home & Garden
`IAB10-7`	Tier 2	Interior Decorating	Home & Garden
`IAB10-8`	Tier 2	Landscaping	Home & Garden
`IAB10-9`	Tier 2	Remodeling & Construction	Home & Garden
`IAB11`	Tier 1	Law, Gov't & Politics	Law, Gov't & Politics
`IAB11-1`	Tier 2	Immigration	Law, Gov't & Politics
`IAB11-2`	Tier 2	Legal Issues	Law, Gov't & Politics
`IAB11-3`	Tier 2	U.S. Government Resources	Law, Gov't & Politics
`IAB11-4`	Tier 2	Politics	Law, Gov't & Politics
`IAB11-5`	Tier 2	Commentary	Law, Gov't & Politics
`IAB12`	Tier 1	News	News
`IAB12-1`	Tier 2	International News	News
`IAB12-2`	Tier 2	National News	News
`IAB12-3`	Tier 2	Local News	News
`IAB13`	Tier 1	Personal Finance	Personal Finance
`IAB13-1`	Tier 2	Beginning Investing	Personal Finance
`IAB13-2`	Tier 2	Credit/Debt & Loans	Personal Finance
`IAB13-3`	Tier 2	Financial News	Personal Finance
`IAB13-4`	Tier 2	Financial Planning	Personal Finance
`IAB13-5`	Tier 2	Hedge Fund	Personal Finance
`IAB13-6`	Tier 2	Insurance	Personal Finance
`IAB13-7`	Tier 2	Investing	Personal Finance
`IAB13-8`	Tier 2	Mutual Funds	Personal Finance
`IAB13-9`	Tier 2	Options	Personal Finance
`IAB13-10`	Tier 2	Retirement Planning	Personal Finance
`IAB13-11`	Tier 2	Stocks	Personal Finance
`IAB13-12`	Tier 2	Tax Planning	Personal Finance
`IAB14`	Tier 1	Society	Society
`IAB14-1`	Tier 2	Dating	Society
`IAB14-2`	Tier 2	Divorce Support	Society
`IAB14-3`	Tier 2	Gay Life	Society
`IAB14-4`	Tier 2	Marriage	Society
`IAB14-5`	Tier 2	Senior Living	Society
`IAB14-6`	Tier 2	Teens	Society
`IAB14-7`	Tier 2	Weddings	Society
`IAB14-8`	Tier 2	Ethnic Specific	Society
`IAB15`	Tier 1	Science	Science
`IAB15-1`	Tier 2	Astrology	Science
`IAB15-2`	Tier 2	Biology	Science
`IAB15-3`	Tier 2	Chemistry	Science
`IAB15-4`	Tier 2	Geology	Science
`IAB15-5`	Tier 2	Paranormal Phenomena	Science
`IAB15-6`	Tier 2	Physics	Science
`IAB15-7`	Tier 2	Space/Astronomy	Science
`IAB15-8`	Tier 2	Geography	Science
`IAB15-9`	Tier 2	Botany	Science
`IAB15-10`	Tier 2	Weather	Science
`IAB16`	Tier 1	Pets	Pets
`IAB16-1`	Tier 2	Aquariums	Pets
`IAB16-2`	Tier 2	Birds	Pets
`IAB16-3`	Tier 2	Cats	Pets
`IAB16-4`	Tier 2	Dogs	Pets
`IAB16-5`	Tier 2	Large Animals	Pets
`IAB16-6`	Tier 2	Reptiles	Pets
`IAB16-7`	Tier 2	Veterinary Medicine	Pets
`IAB17`	Tier 1	Sports	Sports
`IAB17-1`	Tier 2	Auto Racing	Sports
`IAB17-2`	Tier 2	Baseball	Sports
`IAB17-3`	Tier 2	Bicycling	Sports
`IAB17-4`	Tier 2	Bodybuilding	Sports
`IAB17-5`	Tier 2	Boxing	Sports
`IAB17-6`	Tier 2	Canoeing/Kayaking	Sports
`IAB17-7`	Tier 2	Cheerleading	Sports
`IAB17-8`	Tier 2	Climbing	Sports
`IAB17-9`	Tier 2	Cricket	Sports
`IAB17-10`	Tier 2	Figure Skating	Sports
`IAB17-11`	Tier 2	Fly Fishing	Sports
`IAB17-12`	Tier 2	Football	Sports
`IAB17-13`	Tier 2	Freshwater Fishing	Sports
`IAB17-14`	Tier 2	Game & Fish	Sports
`IAB17-15`	Tier 2	Golf	Sports
`IAB17-16`	Tier 2	Horse Racing	Sports
`IAB17-17`	Tier 2	Horses	Sports
`IAB17-18`	Tier 2	Hunting/Shooting	Sports
`IAB17-19`	Tier 2	Inline Skating	Sports
`IAB17-20`	Tier 2	Martial Arts	Sports
`IAB17-21`	Tier 2	Mountain Biking	Sports
`IAB17-22`	Tier 2	NASCAR Racing	Sports
`IAB17-23`	Tier 2	Olympics	Sports
`IAB17-24`	Tier 2	Paintball	Sports
`IAB17-25`	Tier 2	Power & Motorcycles	Sports
`IAB17-26`	Tier 2	Pro Basketball	Sports
`IAB17-27`	Tier 2	Pro Ice Hockey	Sports
`IAB17-28`	Tier 2	Rodeo	Sports
`IAB17-29`	Tier 2	Rugby	Sports
`IAB17-30`	Tier 2	Running/Jogging	Sports
`IAB17-31`	Tier 2	Sailing	Sports
`IAB17-32`	Tier 2	Saltwater Fishing	Sports
`IAB17-33`	Tier 2	Scuba Diving	Sports
`IAB17-34`	Tier 2	Skateboarding	Sports
`IAB17-35`	Tier 2	Skiing	Sports
`IAB17-36`	Tier 2	Snowboarding	Sports
`IAB17-37`	Tier 2	Surfing/Bodyboarding	Sports
`IAB17-38`	Tier 2	Swimming	Sports
`IAB17-39`	Tier 2	Table Tennis/Ping-Pong	Sports
`IAB17-40`	Tier 2	Tennis	Sports
`IAB17-41`	Tier 2	Volleyball	Sports
`IAB17-42`	Tier 2	Walking	Sports
`IAB17-43`	Tier 2	Waterski/Wakeboard	Sports
`IAB17-44`	Tier 2	World Soccer	Sports
`IAB18`	Tier 1	Style & Fashion	Style & Fashion
`IAB18-1`	Tier 2	Beauty	Style & Fashion
`IAB18-2`	Tier 2	Body Art	Style & Fashion
`IAB18-3`	Tier 2	Fashion	Style & Fashion
`IAB18-4`	Tier 2	Jewelry	Style & Fashion
`IAB18-5`	Tier 2	Clothing	Style & Fashion
`IAB18-6`	Tier 2	Accessories	Style & Fashion
`IAB19`	Tier 1	Technology & Computing	Technology & Computing
`IAB19-1`	Tier 2	3-D Graphics	Technology & Computing
`IAB19-2`	Tier 2	Animation	Technology & Computing
`IAB19-3`	Tier 2	Antivirus Software	Technology & Computing
`IAB19-4`	Tier 2	C/C++	Technology & Computing
`IAB19-5`	Tier 2	Cameras & Camcorders	Technology & Computing
`IAB19-6`	Tier 2	Cell Phones	Technology & Computing
`IAB19-7`	Tier 2	Computer Certification	Technology & Computing
`IAB19-8`	Tier 2	Computer Networking	Technology & Computing
`IAB19-9`	Tier 2	Computer Peripherals	Technology & Computing
`IAB19-10`	Tier 2	Computer Reviews	Technology & Computing
`IAB19-11`	Tier 2	Data Centers	Technology & Computing
`IAB19-12`	Tier 2	Databases	Technology & Computing
`IAB19-13`	Tier 2	Desktop Publishing	Technology & Computing
`IAB19-14`	Tier 2	Desktop Video	Technology & Computing
`IAB19-15`	Tier 2	Email	Technology & Computing
`IAB19-16`	Tier 2	Graphics Software	Technology & Computing
`IAB19-17`	Tier 2	Home Video/DVD	Technology & Computing
`IAB19-18`	Tier 2	Internet Technology	Technology & Computing
`IAB19-19`	Tier 2	Java	Technology & Computing
`IAB19-20`	Tier 2	JavaScript	Technology & Computing
`IAB19-21`	Tier 2	Mac Support	Technology & Computing
`IAB19-22`	Tier 2	MP3/MIDI	Technology & Computing
`IAB19-23`	Tier 2	Net Conferencing	Technology & Computing
`IAB19-24`	Tier 2	Net for Beginners	Technology & Computing
`IAB19-25`	Tier 2	Network Security	Technology & Computing
`IAB19-26`	Tier 2	Palmtops/PDAs	Technology & Computing
`IAB19-27`	Tier 2	PC Support	Technology & Computing
`IAB19-28`	Tier 2	Portable	Technology & Computing
`IAB19-29`	Tier 2	Entertainment	Technology & Computing
`IAB19-30`	Tier 2	Shareware/Freeware	Technology & Computing
`IAB19-31`	Tier 2	Unix	Technology & Computing
`IAB19-32`	Tier 2	Visual Basic	Technology & Computing
`IAB19-33`	Tier 2	Web Clip Art	Technology & Computing
`IAB19-34`	Tier 2	Web Design/HTML	Technology & Computing
`IAB19-35`	Tier 2	Web Search	Technology & Computing
`IAB19-36`	Tier 2	Windows	Technology & Computing
`IAB20`	Tier 1	Travel	Travel
`IAB20-1`	Tier 2	Adventure Travel	Travel
`IAB20-2`	Tier 2	Africa	Travel
`IAB20-3`	Tier 2	Air Travel	Travel
`IAB20-4`	Tier 2	Australia & New Zealand	Travel
`IAB20-5`	Tier 2	Bed & Breakfasts	Travel
`IAB20-6`	Tier 2	Budget Travel	Travel
`IAB20-7`	Tier 2	Business Travel	Travel
`IAB20-8`	Tier 2	By US Locale	Travel
`IAB20-9`	Tier 2	Camping	Travel
`IAB20-10`	Tier 2	Canada	Travel
`IAB20-11`	Tier 2	Caribbean	Travel
`IAB20-12`	Tier 2	Cruises	Travel
`IAB20-13`	Tier 2	Eastern Europe	Travel
`IAB20-14`	Tier 2	Europe	Travel
`IAB20-15`	Tier 2	France	Travel
`IAB20-16`	Tier 2	Greece	Travel
`IAB20-17`	Tier 2	Honeymoons/Getaways	Travel
`IAB20-18`	Tier 2	Hotels	Travel
`IAB20-19`	Tier 2	Italy	Travel
`IAB20-20`	Tier 2	Japan	Travel
`IAB20-21`	Tier 2	Mexico & Central America	Travel
`IAB20-22`	Tier 2	National Parks	Travel
`IAB20-23`	Tier 2	South America	Travel
`IAB20-24`	Tier 2	Spas	Travel
`IAB20-25`	Tier 2	Theme Parks	Travel
`IAB20-26`	Tier 2	Traveling with Kids	Travel
`IAB20-27`	Tier 2	United Kingdom	Travel
`IAB21`	Tier 1	Real Estate	Real Estate
`IAB21-1`	Tier 2	Apartments	Real Estate
`IAB21-2`	Tier 2	Architects	Real Estate
`IAB21-3`	Tier 2	Buying/Selling Homes	Real Estate
`IAB22`	Tier 1	Shopping	Shopping
`IAB22-1`	Tier 2	Contests & Freebies	Shopping
`IAB22-2`	Tier 2	Couponing	Shopping
`IAB22-3`	Tier 2	Comparison	Shopping
`IAB22-4`	Tier 2	Engines	Shopping
`IAB23`	Tier 1	Religion & Spirituality	Religion & Spirituality
`IAB23-1`	Tier 2	Alternative Religions	Religion & Spirituality
`IAB23-2`	Tier 2	Atheism/Agnosticism	Religion & Spirituality
`IAB23-3`	Tier 2	Buddhism	Religion & Spirituality
`IAB23-4`	Tier 2	Catholicism	Religion & Spirituality
`IAB23-5`	Tier 2	Christianity	Religion & Spirituality
`IAB23-6`	Tier 2	Hinduism	Religion & Spirituality
`IAB23-7`	Tier 2	Islam	Religion & Spirituality
`IAB23-8`	Tier 2	Judaism	Religion & Spirituality
`IAB23-9`	Tier 2	Latter-Day Saints	Religion & Spirituality
`IAB23-10`	Tier 2	Pagan/Wiccan	Religion & Spirituality
`IAB24`	Tier 1	Uncategorized	Uncategorized
`IAB25`	Tier 1	Non-Standard Content	Non-Standard Content
`IAB25-1`	Tier 2	Unmoderated UGC	Non-Standard Content
`IAB25-2`	Tier 2	Extreme Graphic/Explicit Violence	Non-Standard Content
`IAB25-3`	Tier 2	Pornography	Non-Standard Content
`IAB25-4`	Tier 2	Profane Content	Non-Standard Content
`IAB25-5`	Tier 2	Hate Content	Non-Standard Content
`IAB25-6`	Tier 2	Under Construction	Non-Standard Content
`IAB25-7`	Tier 2	Incentivized	Non-Standard Content
`IAB26`	Tier 1	Illegal Content	Illegal Content
`IAB26-1`	Tier 2	Illegal Content	Illegal Content
`IAB26-2`	Tier 2	Warez	Illegal Content
`IAB26-3`	Tier 2	Spyware/Malware	Illegal Content
`IAB26-4`	Tier 2	Copyright Infringement	Illegal Content

IAB25 (Non-Standard Content) and IAB26 (Illegal Content) are the groups buyers usually block for brand safety. Category names are the IAB Tech Lab labels, published here so a publisher or buyer can look up a code without leaving the auction docs. Source: IAB Content Taxonomy 1.0, as used by OpenRTB.

FAQ

What are IAB categories?

IAB categories are the standard labels for what a page, app, or video is about. The list most bid requests still use is IAB Content Taxonomy 1.0: 26 top-level groups, IAB1 through IAB26, plus the more specific codes under each group.

How many IAB categories are there?

Content Taxonomy 1.0 has 392 categories: 26 tier-1 groups and the tier-2 categories inside them. IAB Tech Lab’s later Content Taxonomy 3.1 is a separate, larger list with numeric IDs rather than IAB1-style codes.

Where are IAB categories used in OpenRTB?

Publishers and SSPs send them in site.cat, app.cat, or content.cat to describe the inventory. Buyers send blocked categories in bcat so an exchange can keep those categories out of the auction.

What is the difference between IAB1 and IAB1-1?

IAB1 is the tier-1 group Arts & Entertainment. IAB1-1 is a tier-2 category inside that group, Books & Literature. A block on IAB1 is broader than a block on IAB1-1.