HTTP/2 & TLS Version Test
See which TLS versions a site accepts and whether it serves HTTP/2.
About the HTTP/2 & TLS Version Test
Run a full server-side handshake test against any public domain: which TLS versions are enabled, whether deprecated SSL 3.0, TLS 1.0 and 1.1 are still accepted, which protocols are advertised over ALPN including HTTP/2, plus forward secrecy, OCSP stapling, HSTS and known protocol vulnerabilities. Each IP address behind the domain is graded separately.
Popular uses
- http/2
- tls version
- alpn
- tls 1.3
- ssl test
- hsts
- server test
Examples
Test a site
example.comOutput
TLS 1.2 and 1.3 enabled, HTTP/2 supported, grade A+Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
Related tools
Bulk URL Status Checker
Network & IP
Check HTTP status codes and redirects for many URLs at once.
Cookie Attribute Analyzer
Network & IP
Parse Set-Cookie headers and flag security issues.
HTTP Cache Header Planner
Network & IP
Plan Cache-Control, ETag and max-age headers for any asset type.
HTTP Header Comparator
Network & IP
Diff two sets of HTTP headers, case-insensitively.
HTTP Headers Explainer
Network & IP
Look up common HTTP headers and explain pasted raw headers.
HTTP Status Codes
Network & IP
Searchable reference of HTTP status codes with meaning and usage guidance.
Works well with
Next steps from other categories.
All Network & IP toolsFrequently asked questions
Version 1.0.0 · Updated 2026-09-16 · Runs entirely in your browser