Alexa InternetAlexa Internet, located in Building 37 of the Presidio of San Francisco, is a California-based subsidiary of Amazon.com. Alexa was founded in 1996 by Brewster Kahle and Bruce Gilliat as a commercial offshoot of the Internet Archive, Alexa Internet created related links for users of the Internet Explorer and Netscape web browsers. Engineers at Alexa created the Internet Archive's Wayback Machine. Alexa also supplies the Internet Archive with web crawls. In 1999, Alexa was acquired by Amazon.com for around $250 million in Amazon stock. Today, Alexa is primarily a Google-based search engine; it also lists websites according to how much traffic they receive. Alexa's partnership with Google began in the spring of 2002.