CDN77 is a Czech content delivery network that is one of the biggest CDN in the world with over 20 thousand servers around the globe. It delivers daily 175 petabytes of data, which is approximately 5 percent of the whole Internet. Their primary focus is video content, which makes up around 90 percent of traffic through CDN77.

This company, established in 2011, considers itself still a startup, although its EBITDA was almost US$68 million in 2022. According to Forbes, its only shareholder Zdeněk Cendra (*1986) is the 25th wealthiest Czech. Customers of CDN77 include European Space Agency, the American online learning platform Udemy, the German television channel Sport1, and esports organizer ESL gaming.


As the first CDN implemented HTTP/2 in 2015, and it is also secured by the latest TLS 1.3 with 0-RTT and its own SSL certificates. Against DDoS attacks, uses proprietary solution based on open-source DPDK, claiming to be able to stop attacks in under 10 seconds. There is also 24/7 live in-house tech support.