Ever wonder how fast your home or wireless internet connection is? Speedtest by Ookla answers those questions for you. | Speedtest

Ookla is proud to announce O2 CZ as the Speedtest Award winner for Fastest 5G Network and Best Mobile Network in Czech Republic! Based on an in-depth analysis of consumer-initiated tests taken with Speedtest during Q3-Q4 2025, O2 CZ achieved a Speed Score of 51.84, with median download speeds of 144.25 Mbps and median upload speeds of 31.30 Mbps. Analysis of consumer-initiated tests taken with Speedtest during the same period further indicates that O2 CZ achieved a Speedtest Connectivity Score o