The IAB categories are an industry standard and are heavily used in services like advertising and Internet security and filtering appliances. There are 26 tier-1 (top level) categories, 366 tier-2 (sub level) categories, and an additional 12 tier-3 categories that are specific to the Webshrinker category service. The total number of categories are 404.
- IAB1 - Arts & Entertainment
- IAB2 - Automotive
- IAB2-1 - Auto Parts
- IAB2-2 - Auto Repair
- IAB2-3 - Buying/Selling Cars
- IAB2-4 - Car Culture
- IAB2-5 - Certified Pre-Owned
- IAB2-6 - Convertible
- IAB2-7 - Coupe
- IAB2-8 - Crossover
- IAB2-9 - Diesel
- IAB2-10 - Electric Vehicle
- IAB2-11 - Hatchback
- IAB2-12 - Hybrid
- IAB2-13 - Luxury
- IAB2-14 - Minivan
- IAB2-15 - Motorcycles
- IAB2-16 - Off-Road Vehicles
- IAB2-17 - Performance Vehicles
- IAB2-18 - Pickup
- IAB2-19 - Road-Side Assistance
- IAB2-20 - Sedan
- IAB2-21 - Trucks & Accessories
- IAB2-22 - Vintage Cars
- IAB2-23 - Wagon
- IAB3 - Business
- IAB3-1 - Advertising
- IAB3-2 - Agriculture
- IAB3-3 - Biotech/Biomedical
- IAB3-4 - Business Software
- IAB3-5 - Construction
- IAB3-6 - Forestry
- IAB3-7 - Government
- IAB3-8 - Green Solutions
- IAB3-9 - Human Resources
- IAB3-10 - Logistics
- IAB3-11 - Marketing
- IAB3-12 - Metals
- IAB4 - Careers
- IAB4-1 - Career Planning
- IAB4-2 - College
- IAB4-3 - Financial Aid
- IAB4-4 - Job Fairs
- IAB4-5 - Job Search
- IAB4-6 - Resume Writing/Advice
- IAB4-7 - Nursing
- IAB4-8 - Scholarships
- IAB4-9 - Telecommuting
- IAB4-10 - Military
- IAB4-11 - Career Advice
- IAB5 - Education
- IAB5-1 - 7-12 Education
- IAB5-2 - Adult Education
- IAB5-3 - Art History
- IAB5-4 - College Administration
- IAB5-5 - College Life
- IAB5-6 - Distance Learning
- IAB5-7 - English as a 2nd Language
- IAB5-8 - Language Learning
- IAB5-9 - College / Graduate School 1
- IAB5-10 - Homeschooling
- IAB5-11 - Homework/Study Tips
- IAB5-12 - K-6 Education 1
- IAB5-13 - Private School
- IAB5-14 - Special Education
- IAB5-15 - Studying Business
- IAB6 - Family & Parenting
- IAB6-1 - Adoption
- IAB6-2 - Babies & Toddlers
- IAB6-3 - Daycare/Pre School
- IAB6-4 - Family Internet
- IAB6-5 - Parenting - K-6 Kids
- IAB6-6 - Parenting teens
- IAB6-7 - Pregnancy
- IAB6-8 - Special Needs Kids
- IAB6-9 - Eldercare
- IAB7 - Health & Fitness
- IAB7-1 - Exercise / Weight Loss 2
- IAB7-2 - ADD
- IAB7-3 - AIDS / HIV
- IAB7-4 - Allergies
- IAB7-5 - Alternative Medicine / Holistic Healing 2
- IAB7-6 - Arthritis
- IAB7-7 - Asthma
- IAB7-8 - Autism / PDD / Asperger’s Syndrome 1
- IAB7-9 - Bipolar Disorder
- IAB7-10 - Brain Tumor
- IAB7-11 - Cancer
- IAB7-12 - Cholesterol
- IAB7-13 - Chronic Fatigue Syndrome
- IAB7-14 - Chronic Pain
- IAB7-15 - Cold & Flu
- IAB7-16 - Deafness
- IAB7-17 - Dental Care
- IAB7-18 - Depression
- IAB7-19 - Dermatology
- IAB7-20 - Diabetes
- IAB7-21 - Epilepsy / Seizures 1
- IAB7-22 - GERD / Acid Reflux
- IAB7-23 - Headaches / Migraines / Fevers / Pain 1
- IAB7-24 - Heart Disease / Stroke 1
- IAB7-25 - Herbs for Health / Supplements / Vitamins 1
IAB7-26 - Holistic Healing(see: IAB7-5) 2- IAB7-27 - IBS / Crohn’s / Celiac Disease 1
- IAB7-28 - Incest / Abuse Support
- IAB7-29 - Incontinence
- IAB7-30 - Infertility
- IAB7-31 - Men’s Health
- IAB7-32 - Nutrition
- IAB7-33 - Orthopedics
- IAB7-34 - Panic / Anxiety Disorders
- IAB7-35 - Pediatrics
- IAB7-36 - Physical Therapy
- IAB7-37 - Psychology / Psychiatry / Therapy 1
- IAB7-38 - Senior Health
- IAB7-39 - Sexuality
- IAB7-40 - Sleep Disorders
- IAB7-41 - Smoking Cessation
- IAB7-42 - Substance Abuse
- IAB7-43 - Thyroid Disease / Endocrinology 1
IAB7-44 - Weight Loss(see: IAB7-1) 2- IAB7-45 - Women’s Health
- IAB7-WS1 - Abortion 4
- IAB8 - Food & Drink
- IAB8-1 - American Cuisine
- IAB8-2 - Barbecues & Grilling
- IAB8-3 - Cajun / Creole
- IAB8-4 - Chinese Cuisine
- IAB8-5 - Cocktails / Beer
- IAB8-6 - Coffee / Tea
- IAB8-7 - Cuisine-Specific
- IAB8-8 - Desserts & Baking
- IAB8-9 - Dining Out
- IAB8-10 - Food Allergies
- IAB8-11 - French Cuisine
- IAB8-12 - Health / Low-Fat Cooking
- IAB8-13 - Italian Cuisine
- IAB8-14 - Japanese Cuisine
- IAB8-15 - Mexican Cuisine
- IAB8-16 - Vegan
- IAB8-17 - Vegetarian
- IAB8-18 - Wine
- IAB9 - Hobbies & Interests
- IAB9-1 - Art / Technology
- IAB9-2 - Arts & Crafts
- IAB9-3 - Beadwork
- IAB9-4 - Bird-Watching
- IAB9-5 - Board Games / Puzzles
- IAB9-6 - Candle & Soap Making
- IAB9-7 - Card Games
- IAB9-8 - Chess
- IAB9-9 - Cigars / Vaping / Tobacco & Accessories 1
- IAB9-10 - Collecting
- IAB9-11 - Comic Books / Anime / Manga 1
- IAB9-12 - Drawing / Sketching
- IAB9-13 - Freelance Writing / Getting Published 2
- IAB9-14 - Genealogy
IAB9-15 - Getting Published(see: IAB9-13) 2- IAB9-16 - Guitar / Keyboard / Drums 1
IAB9-17 - Home Recording- IAB9-18 - Investors / Inventors / Patents / Copyright 1
- IAB9-19 - Jewelry Making
- IAB9-20 - Magic & Illusion
- IAB9-21 - Needlework
- IAB9-22 - Painting
- IAB9-23 - Photography
- IAB9-24 - Radio
- IAB9-25 - Roleplaying Games
- IAB9-26 - Sci-Fi & Fantasy
- IAB9-27 - Scrapbooking
- IAB9-28 - Screenwriting
- IAB9-29 - Stamps & Coins
- IAB9-30 - Video & Computer Games
- IAB9-31 - Woodworking
- IAB9-WS1 - Gambling 4
- IAB9-WS2 - Weapons 4
- IAB10 - Home & Garden
- IAB10-1 - Appliances
- IAB10-2 - Entertaining
- IAB10-3 - Environmental Safety
- IAB10-4 - Gardening
- IAB10-5 - Home Repair
- IAB10-6 - Home Theater
- IAB10-7 - Interior Decorating
- IAB10-8 - Landscaping
- IAB10-9 - Remodeling & Construction
- IAB11 - Law, Government, & Politics
- IAB11-1 - Immigration
- IAB11-2 - Legal Issues
- IAB11-3 - Government Resources 1
- IAB11-4 - Politics
- IAB11-5 - Commentary
- IAB12 - News / Weather / Information 3
- IAB13 - Personal Finance
- IAB13-1 - Beginning Investing
- IAB13-2 - Credit / Debit & Loans
- IAB13-3 - Financial News
- IAB13-4 - Financial Planning
- IAB13-5 - Hedge Fund
- IAB13-6 - Insurance
- IAB13-7 - Investing
- IAB13-8 - Mutual Funds / ETFs 1
- IAB13-9 - Options
- IAB13-10 - Retirement Planning
- IAB13-11 - Stocks
- IAB13-12 - Tax Planning / Accounting 1
- IAB14 - Society
- IAB15 - Science
- IAB15-1 - Astrology
- IAB15-2 - Biology
- IAB15-3 - Chemistry
- IAB15-4 - Geology
- IAB15-5 - Paranormal Phenomena
- IAB15-6 - Physics
- IAB15-7 - Space / Astronomy
- IAB15-8 - Geography
- IAB15-9 - Botany
- IAB15-10 - Weather
- IAB16 - Pets
- IAB16-1 - Aquariums
- IAB16-2 - Birds
- IAB16-3 - Cats
- IAB16-4 - Dogs
- IAB16-5 - Large Animals
- IAB16-6 - Reptiles
- IAB16-7 - Veterinary Medicine
- IAB17 - Sports
- IAB17-1 - Auto Racing
- IAB17-2 - Baseball / Softball 1
- IAB17-3 - Bicycling
- IAB17-4 - Bodybuilding
- IAB17-5 - Boxing
- IAB17-6 - Canoeing / Kayaking
- IAB17-7 - Cheerleading
- IAB17-8 - Climbing
- IAB17-9 - Cricket
- IAB17-10 - Figure Skating
- IAB17-11 - Fly Fishing
- IAB17-12 - American Football 1
- IAB17-13 - Freshwater Fishing
- IAB17-14 - Game & Fish
- IAB17-15 - Golf
- IAB17-16 - Horse Racing
- IAB17-17 - Horses
- IAB17-18 - Hunting / Shooting
- IAB17-19 - Inline Skating
- IAB17-20 - Martial Arts
- IAB17-21 - Mountain Biking
- IAB17-22 - NASCAR Racing
- IAB17-23 - Olympics
- IAB17-24 - Paintball
- IAB17-25 - Power & Motorcycles
- IAB17-26 - Basketball
- IAB17-27 - Ice Hockey
- IAB17-28 - Rodeo
- IAB17-29 - Rugby
- IAB17-30 - Running / Jogging
- IAB17-31 - Sailing / Boating 1
- IAB17-32 - Saltwater Fishing
- IAB17-33 - Scuba Diving
- IAB17-34 - Skateboarding
- IAB17-35 - Skiing
- IAB17-36 - Snowboarding
- IAB17-37 - Surfing / Body-Boarding
- IAB17-38 - Swimming
- IAB17-39 - Table Tennis / Ping-Pong
- IAB17-40 - Tennis
- IAB17-41 - Volleyball
- IAB17-43 - Waterski / Wakeboard
- IAB17-44 - World Football / Soccer 1
- IAB18 - Style & Fashion
- IAB18-1 - Beauty
- IAB18-2 - Body Art
- IAB18-3 - Fashion
- IAB18-4 - Jewelry
- IAB18-5 - Clothing
- IAB18-6 - Accessories
- IAB19 - Technology & Computing
- IAB19-1 - 3-D Graphics
- IAB19-2 - Animation
- IAB19-3 - Antivirus Software
- IAB19-4 - C / C++
- IAB19-5 - Cameras & Camcorders
- IAB19-6 - Cell Phones
- IAB19-7 - Computer Certification
- IAB19-8 - Computer Networking
- IAB19-9 - Computer Peripherals
- IAB19-10 - Computer Reviews
- IAB19-11 - Data Centers
- IAB19-12 - Databases
- IAB19-13 - Desktop Publishing
- IAB19-14 - Desktop Video
- IAB19-15 - Email / Chat / Messaging 2
- IAB19-16 - Graphics Software
- IAB19-17 - Home Video / DVD
- IAB19-18 - Internet Technology
- IAB19-19 - Java
- IAB19-20 - JavaScript
- IAB19-21 - Mac Support
- IAB19-22 - MP3 / MIDI
- IAB19-23 - Net Conferencing
- IAB19-24 - Net for Beginners
- IAB19-25 - Network Security
- IAB19-26 - Palmtops / PDAs / Tablets 1
- IAB19-27 - PC Support
- IAB19-28 - Portable
- IAB19-29 - Entertainment / Virtual & Augmented Reality 1
- IAB19-30 - Shareware / Freeware / Open Source 1
- IAB19-31 - Unix / Linux 1
- IAB19-32 - Visual Basic
- IAB19-33 - Web Clip Art
- IAB19-34 - Web Design / HTML
- IAB19-35 - Web Search
- IAB19-36 - Windows
- IAB19-WS1 - Hacking / Cracking 4
- IAB19-WS2 - VPNs / Proxies & Filter Avoidance 4
- IAB19-WS3 - Language Translation 4
- IAB19-WS4 - File Sharing 4
- IAB20 - Travel
- IAB20-1 - Adventure Travel
- IAB20-2 - Africa
- IAB20-3 - Air Travel
- IAB20-4 - Australia & New Zealand
- IAB20-5 - Bed & Breakfast
- IAB20-6 - Budget Travel
- IAB20-7 - Business Travel
- IAB20-8 - By US Locale
- IAB20-9 - Camping
- IAB20-10 - Canada
- IAB20-11 - Caribbean
- IAB20-12 - Cruises
- IAB20-13 - Eastern Europe
- IAB20-14 - Europe
- IAB20-15 - France
- IAB20-16 - Greece
- IAB20-17 - Honeymoons / Getaways
- IAB20-18 - Hotels
- IAB20-19 - Italy
- IAB20-20 - Japan / China 2
- IAB20-21 - Mexico & Central America
- IAB20-22 - National Parks
- IAB20-23 - South America
- IAB20-24 - Spas
- IAB20-25 - Theme Parks
- IAB20-26 - Traveling with Kids
- IAB20-27 - United Kingdom
- IAB21 - Real Estate
- IAB21-1 - Apartments
- IAB21-2 - Architects
- IAB21-3 - Buying / Selling Homes
- IAB22 - Shopping
- IAB22-1 - Contests & Freebies
- IAB22-2 - Couponing
IAB22-3 - ComparisonIAB22-4 - Engines
- IAB23 - Religion & Spirituality
- IAB23-1 - Alternative Religions
- IAB23-2 - Atheism / Agnosticism
- IAB23-3 - Buddhism
- IAB23-4 - Catholicism
- IAB23-5 - Christianity
- IAB23-6 - Hinduism
- IAB23-7 - Islam
- IAB23-8 - Judaism
- IAB23-9 - Latter-Day Saints
- IAB23-10 - Pagan / Wiccan
- IAB24 - Uncategorized
- IAB25 - Non-Standard Content
- IAB25-1 - Unmoderated UGC / Message Boards 1
- IAB25-2 - Extreme Graphic / Explicit Violence
- IAB25-3 - Adult Content 1
- IAB25-4 - Profane Content
- IAB25-5 - Hate Content
- IAB25-6 - Under Construction
- IAB25-7 - Incentivized
- IAB25-WS1 - Content Server 4
- IAB25-WS2 - Streaming Media 4
- IAB25-WS3 - Trackers 4
- IAB25-WS4 - Cryptomining / Cryptojacking 4
- IAB26 - Illegal Content