While a student at Washington University, Ulevitch created EveryDNS to fill his need for web-based DNS management software. EveryDNS grew from a personal project to a service with nearly 100,000 users worldwide within a few years. In January, 2010, EveryDNS was acquired by Manchester, NH company, Dyn, Inc.
In July, 2006, Ulevitch launched OpenDNS, a recursive DNS service focused on performance and security. On June 30, 2015 Cisco announced that it was buying OpenDNS for $635 million.