dev.certdesk/certdesk

Tools

• check_certificate

  Check one domain's TLS certificate and return a verdict: status OK | WARN | CRITICAL | UNKNOWN, judged from the certificate chain the server actually serves — measured from Korean point A (full chain and CRL revocation) plus Korean point B and an overseas point on the Globalping public measurement network (per-point results in measuredFrom; disagreement between points is a WARN) — verification (expired, not yet valid, hostname mismatch, self-signed, untrusted root, missing intermediate, revoked via CRL), days left, renewal point, a newer certificate issued but not deployed (CT logs), the served chain and the issuing CA's incident history. If the server cannot be measured the status is UNKNOWN and CT logs are shown only as an estimate — never as OK. Set detail=true to include the full chain in the text output.

  shallow
• check_dns

  DNS and hosting facts for a domain: nameservers with DNS provider, A/AAAA with IP owner (ASN), CNAME, MX, CAA (which CAs may issue), SPF/DMARC, DNSSEC, registrar and domain expiry (RDAP).

  shallow
• check_dns_propagation

  Compare answers for one DNS record across resolvers — the authoritative nameservers, Korean ISPs (KT, SK Broadband, LG U+) and public resolvers (Cloudflare, Google, Quad9, OpenDNS) — measured from a Korean network. Use it to confirm a TXT/CNAME for certificate domain validation (e.g. _acme-challenge) has propagated.

  shallow
• check_expiry

  Verdict for up to 5 domains at once: status OK | WARN | CRITICAL | UNKNOWN per domain combining the served certificate (verification, days left — null when the server cannot be measured) and domain registration expiry (RDAP), plus Korean alert lines. Use this for inventories, CI gates (fail unless status is OK) and periodic checks.

  shallow
• check_security

  Security posture check of a web server (no port scanning): TLS protocol support (legacy 1.0/1.1 detection via a Korean network probe), security headers (HSTS/CSP/X-Content-Type-Options/anti-clickjacking/Referrer-Policy), HTTP→HTTPS redirect, and certificate key/signature strength. Returns per-item pass/warn/fail and an overall grade.

  shallow
• explain_tls_error

  Explain a TLS/SSL certificate error message from a browser, curl/OpenSSL, Java, Python, Node.js, Go or .NET: likely causes, fixes, and links to step-by-step guides (Korean). Works offline from a curated knowledge base.

  shallow
• watch_expiry

  Subscribe an email address to free daily expiry monitoring of up to 5 domains (certificate, domain registration and security grade) with email alerts. Double opt-in: a confirmation email is sent and monitoring starts only after the recipient clicks the link. Use only an address the user owns and explicitly asked to use.

  shallow

Embed this server’s score

Tool count and median score across every tool in this server’s corpus — honest in a way a single cherry-picked tool’s badge wouldn’t be.

[![Vouch score](https://vouch.tools/api/servers/9287687e-9c2e-4c42-a59c-ea5d698f495e/badge.svg)](https://vouch.tools/servers/9287687e-9c2e-4c42-a59c-ea5d698f495e)