Check which TLS versions a website accepts using our online TLS Version Checker. Enter a public website domain to test HTTPS connections using TLS 1.0, TLS 1.1, TLS 1.2, and TLS 1.3.
The checker performs separate connection tests from our server and shows which protocol versions it can successfully negotiate. This helps website owners, developers, and hosting administrators identify supported TLS versions and investigate outdated security settings.
How to Check a Website’s TLS Version
Checking the TLS protocol support of a website takes a few simple steps:
- Enter the website’s domain name, such as
example.com, in the checker above. - Click Check TLS versions to start the test.
- Review the results for TLS 1.0, 1.1, 1.2, and 1.3.
- Check which versions show a successful handshake and which could not be confirmed.
- If a result seems unexpected, verify it using another trusted testing environment before changing your website configuration.
You can enter a domain name or an HTTPS URL containing only the hostname. The tool does not accept IP addresses, custom ports, or URL paths.
What Is a TLS Version?
Transport Layer Security (TLS) is a cryptographic protocol that helps protect information exchanged between your browser and a website.
When you visit an HTTPS website, your browser and the website’s server negotiate security settings, including a compatible TLS protocol version. TLS helps protect transmitted information from interception and unauthorized modification.
Several TLS versions have been introduced over time. Modern websites should use current protocols rather than continue supporting obsolete versions.
Understanding TLS 1.0, 1.1, 1.2, and 1.3
| TLS version | Status | Recommendation |
|---|---|---|
| TLS 1.0 | Deprecated | Disable support |
| TLS 1.1 | Deprecated | Disable support |
| TLS 1.2 | Modern, supported | Keep enabled where needed |
| TLS 1.3 | Newer protocol | Enable when supported |
TLS 1.0 and TLS 1.1
TLS 1.0 and TLS 1.1 are outdated protocols. The Internet Engineering Task Force formally deprecated both versions through RFC 8996.
If your website accepts connections using either version, review the minimum TLS settings in your hosting server, content delivery network (CDN), or reverse proxy.
TLS 1.2
TLS 1.2 remains an important protocol for secure HTTPS connections. It supports modern cryptographic mechanisms and provides compatibility with systems that have not adopted TLS 1.3.
TLS 1.3
TLS 1.3 introduces improvements to the TLS handshake and removes several obsolete cryptographic options. It is the newer protocol to support where your server infrastructure and clients allow it.
Important: TLS 1.3 support alone does not prove that a website is completely secure. Certificate validity, server configuration, software updates, and application security also matter.
How to Understand Your TLS Checker Results
The checker attempts to negotiate individual TLS versions and reports one of three outcomes.
| Result | What it means |
|---|---|
| Handshake accepted | The checked endpoint successfully negotiated that TLS version with our server. |
| Not confirmed | The handshake did not succeed. The cause may involve the website, network conditions, or our checking server. |
| Not testable here | Our server’s TLS library does not expose the requested protocol for testing. |
A failed TLS handshake is not always proof that the website has disabled a particular protocol.
For example, a hosting provider may prevent its servers from initiating outdated TLS connections. In that situation, the checker may be unable to confirm TLS 1.0 or TLS 1.1 support even if the target endpoint accepts those protocols from another client.
How Does Our TLS Version Checker Work?
The NetTools Pakistan checker runs on our WordPress hosting server rather than inside your browser.
After receiving a valid public domain name, it resolves the domain to a public IPv4 address and attempts separate TLS handshakes through HTTPS port 443.
The checker uses the requested hostname during TLS negotiation, which helps it test websites hosted on shared infrastructure.
Its results describe the connection between our checking server and one resolved website endpoint.
The checker does not download website pages, follow redirects, or inspect website content. It also does not validate the website’s SSL/TLS certificate or perform a comprehensive vulnerability assessment.
If a website uses several servers or CDN locations, other endpoints may have different configurations.
Why Might a Website Fail a TLS Version Test?
An unsuccessful handshake may have several explanations.
The protocol is disabled: The website may reject connections using an older TLS version.
The checking server restricts the protocol: Its OpenSSL configuration or security policy may prevent a connection attempt using that version.
A firewall blocks the connection: Network restrictions may interfere with communication between the checking server and the website.
The website is temporarily unreachable: Hosting outages, DNS issues, or connection timeouts may prevent the test from completing.
Different servers use different configurations: A website using multiple IP addresses or CDN locations may return different results depending on the endpoint tested.
If the checker cannot confirm a protocol, repeat the test from another trusted environment before drawing conclusions.
What Should You Do If Your Website Supports Outdated TLS?
If TLS 1.0 or TLS 1.1 is accepted, review your website’s HTTPS configuration.
Check the minimum supported TLS version in your web server, hosting control panel, load balancer, or CDN settings. For modern public websites, TLS 1.2 or higher is the appropriate baseline.
Before making changes, consider whether any legitimate applications or older clients depend on the protocols you plan to disable. Update those clients where possible, then retest your website after making the configuration changes.
If you use managed hosting, contact your provider for help identifying which system controls your website’s TLS settings.
TLS Version Checker: Important Limitations
This tool provides a focused TLS protocol compatibility check, not a complete website security audit.
- It tests one resolved public IPv4 endpoint and does not support IPv6-only websites.
- Results come from the NetTools Pakistan hosting server, not the visitor’s browser or internet connection.
- Certificate validity, expiration dates, certificate chains, cipher strength, and HTTP security headers are not examined.
- TLS handshake failures may be influenced by local security policies, firewalls, or temporary network conditions.
- The checker accepts public website domains only. It cannot scan local networks or private IP addresses.
Website domains submitted for testing are processed by our server. The plugin also uses temporary caching and rate-limiting information. Ordinary hosting and server logging policies may apply.
Frequently Asked Questions
How can I check whether my website supports TLS 1.3?
Enter your website’s public domain in the TLS Version Checker and run the test. If TLS 1.3 shows Handshake accepted, the checked endpoint successfully negotiated that protocol with our server.
Is TLS the same as SSL?
TLS is the successor to Secure Sockets Layer (SSL). People often use the term SSL certificate when referring to certificates used with HTTPS, even though modern encrypted website connections use TLS.
Can a website support TLS 1.2 and TLS 1.3 together?
Yes. A website can support both versions. During an HTTPS connection, the client and server negotiate a mutually supported protocol version according to their configuration.
Does this tool check SSL certificate expiration?
No. This checker tests protocol negotiation only. Certificate expiration and certificate trust require a separate certificate inspection.
Technical References
For official information about TLS standards and their implementation, consult:
- RFC 8996: Deprecating TLS 1.0 and TLS 1.1
- RFC 8446: TLS Protocol Version 1.3
- PHP Documentation: TLS Stream Encryption
NetTools Pakistan is an independent internet connectivity website and is not affiliated with PTCL, PTA, or any internet service provider.