Free Cybersecurity Tools for DNS, Email, SSL, Routing, and PQC

What EP Cybertools is for

EP Cybertools is a free, practitioner-built cybersecurity toolkit for people who debug real networks: security engineers, system administrators, DevOps and SRE teams, SOC analysts, and IT professionals who need DNS, email, SSL/TLS, routing and post-quantum answers without waiting on a vendor portal or a paid SaaS seat. The product focus is hands-on diagnosis—live protocol checks you can re-run while you change a record—not generic marketing summaries.

Typical jobs the toolkit solves: proving why mail is quarantined (SPF alignment, DKIM body hash, DMARC policy), confirming a certificate chain and TLS configuration after a renewal or CDN cutover, inspecting DNS and DNSSEC before a migration, checking BGP/RPKI context for an IP, reviewing reputation before an outbound campaign, and measuring post-quantum hybrid readiness against NIST ML-KEM, ML-DSA and SLH-DSA. More than seventy tools are grouped by protocol domain so you can stay inside one workflow instead of bouncing across unrelated utilities.

How the tools work: you submit a domain, host, certificate or other input; the service performs the relevant lookups or analysis and returns structured results in the browser. No account is required for standard diagnostics. Educational guides under each tool explain what the check does, when to use it, how to read the output, common errors and fixes, and frequently asked questions, with FAQ structured data where applicable. Command-line examples are included so you can reproduce findings offline.

Trust and privacy: we do not sell the domains or hosts you query. The encrypted file share only accepts client-side EPCYFS ciphertext (password or certificate); the server never sees plaintext, passwords or private keys. The site is delivered through Cloudflare for availability and abuse resistance while keeping diagnostics focused on operator depth. Legal details live under Privacy, Terms, Cookies and Disclaimer.

Keep learning from the blog, the security news feed, the PQC hub and the PQC documentation. For mission and authorship see About EP Cybertools, or jump straight to the full catalog and SuperTool when you already know which check you need.