Seznam.cz: Kokura Data Center

Kokura Data Center is a data center facility operated for Seznam.cz, a.s. in Prague – Horní Počernice, Czech Republic. Seznam identifies Kokura as one of its owned data centers, and its 2024 announcement states that the original facility in Horní Počernice was commissioned in 2015 and later expanded with a third data center building. A Seznam-owned operating company, Seznam.cz datová centra, s.r.o., is listed at U tabulky 2948, 193 00 Praha, Horní Počernice and states that it operates the Kokura data center and monitoring services for Seznam.cz.

Horní Počernice sits within the Prague metro, the Czech Republic’s main commercial and network hub. This gives Kokura proximity to the country’s largest digital economy, dense transport infrastructure, and a major concentration of enterprise and internet traffic. Seznam’s published materials position Kokura as a core part of its national digital infrastructure, with a strong focus on resilience, energy efficiency, and large-scale service delivery.

⚙️ Facility Highlights

1. Facility identity and operator: Seznam identifies Kokura as one of its owned data centers in Horní Počernice, Prague.
2. Full address: U tabulky 2948, 193 00 Praha, Horní Počernice, Czech Republic.
3. Commissioning timeline: The original Kokura facility was commissioned in 2015.
4. Data hall expansion: Seznam states Kokura now has three data halls, with the third building opened in May 2024.
5. Facility scale: Seznam stated in 2016 that Kokura housed 300 tons of hardware, with a 2,500 m² building area and a 10,500 m² total site area.
6. Power capacity context: Seznam states that across its owned sites, Nagoya and Kokura, up to 6 MW of IT power is planned in total.
7. Cooling architecture: Seznam states Kokura uses indirect free cooling based on a closed air circuit.
8. Energy efficiency: Seznam states the facility operates at around PUE 1.2.
9. Sustainability measures: Seznam states Kokura runs on 100 percent green electricity. It also states that Kokura 3 includes a water treatment system using rainwater stored in an underground tank to support rooftop air handling units.
10. Power design innovation: In Kokura 3, Seznam states that one power branch omits UPS and batteries, relying instead on redundancy in IT power supply design.

🔐 Security & Compliance

1. Operational monitoring: The Seznam-owned operating company states that it provides monitoring services for the Kokura data center.
2. Biometric access control: Seznam states access to the server halls is controlled through biometric palm-vein verification.
3. Resilience testing: Seznam reported a scheduled full-location outage test at Kokura in 2024 to validate operating resilience.

🌐 Connectivity & Carrier Access

1. Seznam described Kokura as a central traffic node for its internet services and stated in 2016 that roughly three quarters of internet users in the Czech Republic reached one of Seznam’s servers at least once per day through infrastructure associated with Kokura.
2. Seznam stated that Kokura sends and receives tens of petabytes of data per month, reflecting its role in supporting large-scale digital services and traffic-intensive workloads.
3. The facility uses two optical connections, and Seznam states that the site contains several dozen kilometers of cabling and 70 kilometers of optical fiber.

💼 Who It Serves

1. Seznam’s own digital service infrastructure, including high-volume consumer internet workloads.
2. Internal platforms handling traffic-intensive and data-intensive services, including workloads tied to continued growth in online content and storage.