host.tools

SSL certificate inspector

SSL/TLS /api/v1/ssl/cert

Issuer, SAN, validity, fingerprints, full chain — for any TLS endpoint.

Try: host.com checkhost.com cloudflare.com github.com
Related: DNS lookup (dig) DNS propagation Domain WHOIS SSL certificate inspector HTTP headers Security headers grader MX lookup SPF tester DMARC tester

dns.quad9.net

issued by C=US, O=DigiCert Inc, CN=DigiCert Global G3 TLS ECC SHA384 2020 CA1
valid 79 days left
Subject
C=CH, ST=Zurich, L=Zurich, O=Quad9, CN=dns.quad9.net
Valid from
2025-07-01T00:00:00+00:00
Valid to
2026-07-27T23:59:59+00:00
Handshake
84 ms
Subject Alternative Names (46)
dns.quad9.net dns-nosec.quad9.net doh-brave.quad9.net dns.resolver.quad9.net alpha-dns.quad9.net beta-dns.quad9.net dns9.quad9.net dns10.quad9.net dns11.quad9.net dns12.quad9.net dns13.quad9.net dns14.quad9.net dns15.quad9.net dns254.quad9.net 9.9.9.9 9.9.9.10 9.9.9.11 9.9.9.12 9.9.9.13 9.9.9.14 9.9.9.15 149.112.112.9 149.112.112.10 149.112.112.11 149.112.112.12 149.112.112.13 149.112.112.14 149.112.112.15 149.112.112.112 2620:FE:0:0:0:0:0:FE 2620:FE:0:0:0:0:0:9 2620:FE:0:0:0:0:0:10 2620:FE:0:0:0:0:0:11 2620:FE:0:0:0:0:0:12 2620:FE:0:0:0:0:0:13 2620:FE:0:0:0:0:0:14 2620:FE:0:0:0:0:0:15 2620:FE:0:0:0:0:FE:9 2620:FE:0:0:0:0:FE:10 2620:FE:0:0:0:0:FE:11 2620:FE:0:0:0:0:FE:12 2620:FE:0:0:0:0:FE:13 2620:FE:0:0:0:0:FE:14 2620:FE:0:0:0:0:FE:15 doh-chrome.quad9.net doh-mozilla.quad9.net
Certificate chain (2)
  1. #0
    dns.quad9.net
    issuer: C=US, O=DigiCert Inc, CN=DigiCert Global G3 TLS ECC SHA384 2020 CA1
  2. #1
    DigiCert Global G3 TLS ECC SHA384 2020 CA1
    issuer: C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert Global Root G3
Fingerprints
SHA-1
D4:FD:29:4F:5E:3F:38:9C:46:9B:F1:54:CC:51:FC:00:D4:15:3B:98:
SHA-256
48:2C:41:86:55:50:32:51:9D:3D:1D:AA:40:8F:AC:0E:63:C7:0A:F3:0D:22:AD:3E:57:C2:D4:9E:3B:4F:DB:DC:
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How to use SSL certificate inspector
  1. 1
    Paste your input

    Enter the value at the top — domain, IP, URL, email, ASN, hash, whatever fits this tool. The smart input auto-detects type.

  2. 2
    Click "Inspect"

    host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.

  3. 3
    Open the API tab

    Every web tool has a sibling /api/v1/ssl/cert JSON endpoint with the same payload. One copy-as-curl click and you're scripting it.

Why this matters

TLS misconfigurations cause silent failure: cert chains break, ciphers drift, HSTS times out. A 30-second cert audit beats a 3 AM page every single time.

API equivalent
/api/v1/ssl/cert?q=hoytv.de5.net 
curl -s '/api/v1/ssl/cert?q=hoytv.de5.net'
Embed this tool
<iframe src="/ssl/cert?q={INPUT}&embed=1"
  width="100%" height="600" frameborder="0"></iframe>

Drop into any HTML page. The embed=1 flag hides nav and footer.

FAQ · SSL certificate inspector

Common questions

Is SSL certificate inspector free?
Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/ssl/cert is free up to 100 requests/hour, no key required.
Where does the data come from?
Real-time probes against authoritative sources (DNS root, RIRs, registries, the target server itself), plus partner data feeds from hostinfo.com (GeoIP/ASN) and hostcheck.com (reputation).
How fresh are the results?
Live by default. Cached for 5 minutes to make repeat queries instant; pass ?nocache=1 for a forced refresh.
Can I run this from the command line?
Yes — every tool ships with a copy-as-curl. There's also an official CLI: host.tools ssl cert YOUR_INPUT.
Can I monitor results over time?
Pro tier lets you schedule any tool to run every 1/5/15/60 min and alert on diff. See monitors.
host.tools Pro

Run SSL certificate inspector on a schedule. Get pinged when it changes.

Pro gets you bulk lookups, monitors, webhook alerts, history, exports and 10,000 API calls/day. $19/mo.

See pricing Tour monitors
  • ✓Schedule any tool — every 1, 5, 15, 60 min
  • ✓Diff against last run, alert on change
  • ✓Webhook + email + Slack + PagerDuty + OpsGenie
  • ✓Bulk CSV upload, 1,000 inputs per job
  • ✓Export results as CSV / NDJSON / Excel
  • ✓90-day history, comparison view