Sylvain Lugeon, Tiziano Piccardi, Robert West &ndash; EPFL, Switzerland
Top-level domain. Some top-level domains (TLD) such as .edu or .biz can offer a good hint about the website's content. For example, a typical use case for .edu is university websites, whereas .biz is commonly associated with business activities. Following this intuition, we collected from Common Crawl,5 a large-scale sample of the Web, the 19 most frequent TLDs: .com, .org, .net, .info, .xyz, .club, .biz, .top, .edu, .online, .pro, .site, .vip, .icu, .buzz, .app, .asia, .gov, .space, excluding the country code TLD (ccTLD) because they indicate geographic origin, not website content. We represent this feature with a one-hot encoding vector of 19 dimensions.