Coders HubCoders Hub

HTTP/2 & TLS Version Test

See which TLS versions a site accepts and whether it serves HTTP/2.

Support
No Login

Enter a domain to see which TLS versions it accepts and whether it negotiates HTTP/2. A full scan takes a minute or two.

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.

Examples

Test a site

example.com

Output

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.

Frequently asked questions

Comments

No login needed. Comments appear after a quick review.

Protected by an on-site captcha — no third-party trackers.

Optional: get an alert when your comment is published or replied to, plus new tool announcements. No sign-up.

Loading comments…

Version 1.0.0 · Updated 2026-09-16 · Runs entirely in your browser