SSL certificate
See certificate identity and validity signals.
Open check →QUICKFIX / FREE TOOLS
Eight free read-only checks.
Useful public signals for a website, with clear limits. No credentials required. No changes made. Active security testing is never started from these tools.
FREE PASSIVE CHECK
These tools use bounded public requests. They show evidence and limits, not a complete security or reliability verdict.
These tools use bounded public requests. They show evidence and limits, not a complete security or reliability verdict.
CHOOSE A SIGNAL
Start with the question you already have.
DNS
Review the bounded public address result for a domain.
Open check →SPF
Find the public SPF record and its basic syntax signal.
Open check →DMARC
Find the public DMARC record and its policy signal.
Open check →Security headers
Review a bounded set of response headers.
Open check →Redirects
See the bounded public redirect chain.
Open check →Robots and sitemap
Check public crawler files and bounded sitemap discovery.
Open check →Availability
Check one bounded public response, not continuous uptime.
Open check →