Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BTLS Certificate Expiry & Recommendations83 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
ADNS Records1 A records, 40 ms lookupPASS
| A | 23.185.0.3 |
| AAAA | 2620:12a:8001::3, 2620:12a:8000::3 |
| CNAME | — |
| NS | — |
| MX | — |
| TXT | — |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.
Learn more ▾ ▴
SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.
Source: RFC 7208 (SPF)
A+Redirect ChainNo redirects — direct accessPASS
https://www.cncf.io
8 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://www.cncf.io | 200 | 8 ms | HTTP/1.1 | nginx |
A+IPv6 ReadinessIPv6 reachable (0 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 3101 URLsPASS
User-agent: *
Disallow: /wp/wp-admin/
Allow: /wp/wp-admin/admin-ajax.php
Sitemap: https://www.cncf.io/sitemap.xml
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: www
HTTP → HTTPS
Consistent
A+Domain Intelligencecncf.io — via 1API GmbH, 10 years, 10 months oldPASS
31 days
July 16, 2026
83 days
Issued by Let's Encrypt
10 years, 10 months
Registered July 16, 2015
Status unknown
Protects against DNS spoofing
Unknown
2620:12a:8001::3
1API GmbH
Expiry timeline
Recommended actions
- Renew the domain or enable auto-renewal to prevent accidental expiry