Topic cluster

SSL / HTTPS Tools

SSL and HTTPS checks help confirm that a website presents the expected certificate identity, stays inside its validity window and publishes browser security headers intentionally.

Tools

Focused tools for this topic

Check SSL certificate identity and expiration, inspect HTTPS-related headers and understand common TLS problems.

SSL 证书检查器

查看主机名最新的公共证书透明度记录，包括证书身份、签发机构、有效期与剩余时间。

HTTP 响应头检查器

检查公开网站的 HTTP 响应头，并快速判断常见浏览器安全响应头是否存在。

CAA 记录检查器

检查域名允许哪些证书颁发机构签发 TLS 证书，以及是否配置违规签发报告。

DNS HTTPS / SVCB 记录查询

查询现代 DNS HTTPS 与 SVCB 服务绑定记录，包括优先级、目标与已发布的连接参数。

User Agent 解析器

在浏览器本地解析 User Agent，识别浏览器、操作系统、设备类型、渲染引擎与架构。

Overview

What to know before using these checks

What these checks can and cannot prove

Certificate transparency data is useful for identity and lifecycle review, while HTTP headers show what a public URL returns to a browser.

A complete TLS audit also needs a live handshake and protocol scan. NexKit keeps this first phase focused on quick public diagnostics.

Related guides

Learn the concepts behind the tools

What Is an SSL Certificate?

Learn what SSL certificates do, what they contain and why they matter for HTTPS websites.

SSL vs TLS

Understand the difference between SSL and TLS and why modern HTTPS uses TLS even when people say SSL.

FAQ

Common questions

Is SSL the same as HTTPS?

HTTPS is HTTP carried over TLS. People still say SSL certificate, but modern HTTPS uses TLS rather than the old SSL protocols.

Why do certificates expire?

Expiration forces regular key and identity renewal, limits the lifetime of mistakes, and keeps domain validation fresh.