HTTP/2 Web Server Online Tester
This tool is useful to check if a given website is hosted by a server with HTTP/2.0 protocol support.
curl --http2 to perform a HEAD query which works for linux servers, windows servers, etc.
Application-Layer Protocol Negotiation requires a valid SSL certificate and TLSv1.2 or newer.
Unencrypted HTTP test is optional since all major browsers support HTTP/2 using ALPN only.
You can also check your browser's H2 and IPv6 support using Dual-stack IP address tester.
Recommended for webmasters: How to choose better web hosting services.
You can also check your website using: HTTP/1 Web Server Online Tester.