| 4 | Unknown | Not categorized |
| 4 | Advertisements and Pop-Ups | Sites that provide advertising graphics or other ad content files that appear on Web pages. |
| 2 | Alcohol and Tobacco | Sites that promote or sell alcohol- or tobacco-related products or services. |
| 5 | Anonymizers | Sites that act as an intermediary for surfing to other websites in an anonymous fashion, whether to circumvent web filtering or for other reasons. |
| 1 | Arts | Sites with artistic content or relating to artistic institutions such as theaters, museums, galleries, dance companies, photography, and digital graphic resources. |
| 1 | Business | Sites that provide business related information such as corporate web sites. Information, services, or products that help businesses of all sizes to do their day-to-day commercial activities. |
| 1 | Transportation | Sites that include information about motor vehicles such as cars, motorcycles, boats, trucks, RVs and the like, including online purchase sites. Includes manufacturer sites, dealerships, review sites, pricing, enthusiasts clubs, etc. |
| 3 | Chat | Sites that enable web-based exchange of real-time messages through chat services or chat rooms |
| 1 | Kids sites | Websites that are family and children oriented. |
| 2 | Forums and Newsgroups | Sites for sharing information in the form of newsgroups, forums, bulletin boards. Does not include personal blogs. |
| 5 | Compromised | Sites that have been compromised by someone other than the site owner in order to install malicious programs without the user's knowledge. Includes sites that may be vulnerable to a particular highrisk attack. |
| 1 | Computers and Technology | Sites that contain information such as product reviews, discussions, and news about computers, software, hardware, peripheral and computers services. |
| 3 | Criminal Activity | Sites that offer advice on how to commit illegal or criminal activities, or to avoid detection. These can include how to commit murder, build bombs, pick locks, etc. Also includes sites with information about illegal manipulation of electronic devices, hacking, fraud and illegal distribution of software. |
| 3 | Dating and Personals | Sites that promote networking for interpersonal relationships such as dating and marriage. Includes sites for match-making, online dating, spousal introduction, escort services. |
| 4 | Download Sites | Sites that contain downloadable software, whether shareware, freeware, or for a charge. Includes some peer-to-peer sites. |
| 1 | Education | Sites sponsored by educational institutions and schools of all types including distance education. Includes general educational and reference materials such as dictionaries, encyclopedias, online courses, teaching aids and discussion guides |
| 2 | Entertainment | Sites containing programming guides to television, movies, music and video (including video on demand), celebrity sites, and entertainment news. |
| 2 | Finance | Sites related to banking, finance, payment or investment, including banks, brokerages, online stock trading, stock quotes, fund management, insurance companies, credit unions, credit card companies, and so on. |
| 4 | Gambling | Sites that offer or are related to online gambling, lottery, casinos and betting agencies involving chance. |
| 2 | Games | Sites relating to computer or other games, information about game producers, or how to obtain cheat codes. Game-related publication sites. |
| 1 | Government | Sites run by governmental or military organizations, departments, or agencies, including police departments, fire departments, customs bureaus, emergency services, civil defense, counterterrorism organizations and hospitals. |
| 2 | Hate and Intolerance | Sites that promote a supremacist political agenda, encouraging oppression of people or groups of people based on their race, religion, gender, age, disability, sexual orientation or nationality. |
| 2 | Health and Medicine | Sites containing information pertaining to health, healthcare services, fitness and wellbeing, including information about medical equipment, hospitals, drugstores, nursing, medicine, procedures, prescription medications, etc |
| 2 | Illegal Drug | Sites with information on the purchase, manufacture, and use of illegal or recreational drugs and their paraphernalia, and misuse of prescription drugs and other compounds. |
| 1 | Job Search | Sites containing job listings, career information, assistance with job searches (such as resume writing, interviewing tips, etc.), employment agencies or head hunters. |
| 3 | Military | Information on military branches, armed services, and military history. |
| 4 | Streaming Media and Downloads | Sites that deliver streaming content, such as Internet radio, Internet TV or MP3 and live or archived media download sites. Includes fan sites, or official sites run by musicians, bands, or record labels. |
| 1 | News | Sites covering news and current events such as newspapers, newswire services, personalized news services, broadcasting sites, and magazines. |
| 2 | Non-profits and NGOs | Sites devoted to clubs, communities, unions, and non-profit organizations. Many of these groups exist for educational or charitable purposes. |
| 2 | Nudity | Sites that contain full or partial nudity that are not necessarily overtly sexual in intent. Includes sites that advertise or sell lingerie, intimate apparel, or swimwear. |
| 3 | Personal Sites | Sites about or hosted by personal individuals, including those hosted on commercial sites such as Blogger, AOL, etc. |
| 5 | Phishing and Fraud | Sites that are used for deceptive or fraudulent purposes (e.g. phishing), such as stealing financial or other user account information. These sites are most often designed to appear as legitimate sites in order to mislead users into entering their credentials |
| 1 | Politics | Sites that promote political parties or political advocacy, or provide information about political parties, interest groups, elections, legislation or lobbying. Also includes sites that offer legal information and advice. |
| 5 | Pornography/Sexually Explicit | Sites that contain explicit sexual content. Includes adult products such as sex toys, CD-ROMs, and videos, adult services such as videoconferencing, escort services, and strip clubs, erotic stories and textual descriptions of sexual acts. |
| 2 | Real Estate | Sites relating to commercial or residential real estate services, including renting, purchasing, selling or financing homes, offices, etc. |
| 2 | Religion | Sites that deal with faith, human spirituality or religious beliefs, including sites of churches, synagogues, mosques and other houses of worship. |
| 1 | Restaurants and Dining | Sites that list, review, promote or advertise food, dining or catering services. Includes sites for recipes sites, cooking instruction and tips, food products, and wine advisors. |
| 1 | Search Engines and Portals | Sites enabling the searching of the Web, newsgroups, images, directories, and other online content. Includes portal and directory sites such as white/yellow pages. |
| 2 | Shopping | Sites for online shopping, catalogs, online ordering, auctions, classified ads. Excludes shopping for products and services exclusively covered by another category such as health & medecine. |
| 3 | Social Networking | Sites that enable social networking for online communities of various topics, for friendship, dating, or professional reasons. |
| 5 | Spam Sites | Sites that have been promoted through spam techniques. |
| 1 | Sports | Sites relating to sports teams, fan clubs, scores and sports news. Relates to all sports, whether professional or recreational. |
| 5 | Malware | Sites that install unwanted software on a user's computer with the intent to make system changes or enable third-party monitoring without the user's consent. |
| 2 | Stock trading | Promotion and facilitation of securities trading and management of investment assets. Also includes information on financial investment strategies, quotes, and news. |
| 1 | Translators | Sites that translate Web pages or phrases from one language to another. These sites bypass the proxy server, presenting the risk that unauthorized content may be accessed, similar to using an anonymizer |
| 1 | Travel | Sites that provide travel and tourism information or online booking or travel services such as airlines, accommodations, car rentals. Includes regional or city information sites. |
| 2 | Violence | Sites that contain images or text depicting or advocating physical assault against humans, animals, or institutions. Sites of a particularly gruesome nature. Sites that contain profanity. |
| 2 | Weapons | Sites that depict, sell, review or describe guns and weapons, including for sport. |
| 4 | Web-based Email | Sites that enables users to send and receive email through a web-accessible email account. |
| 3 | General | Sites that do not clearly fall into other categories, for example, blank web pages |
| 2 | Leisure and Recreation | Sites relating to recreational activities and hobbies including zoos, public recreation centers, pools, amusement parks, and hobbies such as gardening, literature, arts & crafts, home improvement, home décor, family, etc. |
| 2 | Online training and tools | Distance education, online courses, vocational training, software training, skills training. |
| 2 | Legal | Legal websites, law firms, discussions and analysis of legal issues. |
| 2 | Local Information | City guides and tourist information, including restaurants, area information and local points of interest. |
| 2 | Reference and Research | Personal, professional, or educational reference material, including online dictionaries, maps, library catalogues and scientific information. |
| 1 | Technical or business forums and news groups | Websites with discussions of user-generated content related to business or technical development. |
| 1 | Technical information and documentation | Websites that provide information on technical information and documentation. |
| 4 | Personal Storage | Websites that allow the uploading of files for remote data storage. |
| 2 | CDNs | Content distribution networks |
| 2 | Profanity | Websites which contain excessive use of profanity or obscenities. |
| 2 | Professional social networks | The subset of social networking websites which includes content intended exclusively for businesses or professionals. |
| 5 | Botnets | Sites that manage networks of bots through command-and-control centers. |
| 2 | Cults | Sites relating to non-traditional religious practice typically known as cults, that is, considered to be false, unorthodox, extremist, or coercive, with members often living under the direction of a charismatic leader. |
| 2 | Fashion and Beauty | Sites concerning fashion, jewelry, glamour, beauty, modeling, cosmetics or related products or services. Includes product reviews, comparisons, and general consumer information. |
| 2 | Greeting cards | Sites that allow people to send and receive greeting cards and postcards. |
| 5 | Hacking | Sites that promote or give advice about how to gain unauthorized access to proprietary computer systems, for the purpose of stealing information, perpetrating fraud, creating viruses, or committing other illegal activity related to theft of digital inform |
| 5 | Cryptocurrency Mining | Sites that use cryptocurrency mining technology without user permission. |
| 5 | Illegal Software | Sites that illegally distribute software or copyrighted materials such as movies or music, software cracks, illicit serial numbers, illegal license key generators. |
| 4 | Image Sharing | Sites that host digital photographs and images, online photo albums and digital photo exchanges. |
| 2 | Information Security | Sites that provide legitimate information about data protection, including newly discovered vulnerabilities and how to block them |
| 3 | Instant Messaging | Sites that enable logging in to instant messaging services such as ICQ, AOL Instant Messenger, IRC, MSN, Jabber, Yahoo Messenger, and the like |
| 1 | Network Errors | Sites that do not resolve to any IP address. |
| 3 | Parked Domains | Sites that are inactive, typically reserved for later use. They most often do not contain their own content, may simply say "under construction," "purchase this domain," or display advertisements. |
| 4 | Peer-to-Peer | Sites that enable direct exchange of files between users without dependence on a central server. |
| 4 | Private IP Addresses | Sites that are private IP addresses as defined in RFC 1918, that is, hosts that do not require access to hosts in other enterprises (or require just limited access) and whose IP address may be ambiguous between enterprises but are well defined within a certain enterprise. |
| 2 | School Cheating | Sites that promote unethical practices such as cheating or plagiarism by providing test answers, written essays, research papers, or term papers. |
| 2 | Sex Education | Sites relating to sex education, including subjects such as respect for partner, abortion, gay and lesbian lifestyle, contraceptives, sexually transmitted diseases, and pregnancy. |
| 3 | Tasteless | Sites with offensive or tasteless content such as bathroom humor, or gruesome or even frightening content such as shocking depictions of blood or wounds, or cruel animal treatment. |
| 2 | Child Abuse Images | Sites that portray or discuss children in sexual or other abusive acts |
| 1 | Gay, Lesbian or Bisexual | Web pages that cater to or discuss the gay, lesbian, bisexual or transgender lifestyle. |
| 2 | Literature and Books | Web pages for published writings including fiction and non-fiction novels, poems and biographies. |
| 2 | Nutrition and Diet | Web pages on losing weight and eating healthy, diet plans, weight loss programs and food allergies. |
| 2 | Pets and Animals | Web pages with information or products and services for pets and other animals including birds, fish, and insects. |
| 2 | Updates | All sites with software updates, OS updates, security updates. |
| 2 | Reputation: Low risk | Sites with low reputational risk. Web sites with no known security risks, but belonging to categories of sites that may be a risk. |
| 3 | Reputation: Medium risk | Sites with medium reputational risk. Web sites that may be harmless, but belong to categories of sites that could harm your computer. |
| 5 | Reputation: High risk | Sites with high reputational risk. Web sites that are confirmed to be a security risk. |
