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.
Focused tools for this topic
Check SSL certificate identity and expiration, inspect HTTPS-related headers and understand common TLS problems.
Review a hostname's latest public Certificate Transparency record, including identity, issuer, validity dates and remaining lifetime.
HTTP Header CheckerInspect a public website's response headers and quickly check for common browser-security headers.
CAA Record CheckerCheck which certificate authorities a domain authorizes to issue TLS certificates and whether incident reporting is configured.
DNS HTTPS / SVCB Record LookupLook up modern DNS HTTPS and SVCB service-binding records, including priority, target and published connection parameters.
User Agent ParserParse a browser user agent locally to identify the browser, operating system, device class, rendering engine and architecture.
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.
Learn the concepts behind the tools
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.