ブラウザネットワーク機能テスター
This reads the Network Information API: whether the browser is online, the connection type (wifi, cellular), and the browser's estimated downlink speed and RTT (round-trip time). Estimates are coarse and browser-dependent, so use them to adapt the UI, not to measure a link.
ツールの結果は英語で生成されます。
オンライン
接続
Downlink (estimate)
RTT (estimate)
Download speed
Fetches 2 MB from Cloudflare. The result includes request latency, so it is a rough throughput check rather than a calibrated speed test.
WebRTC IP leak
Gathers ICE candidates through a public STUN server. Browsers may mask local IPs with mDNS (.local); no candidate at all means UDP/STUN is blocked.