Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations88 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
- 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
BCDN & DeliveryCloudflareREVIEW
ADNS Records2 A records, 41 ms lookupPASS
| A | 172.66.40.249, 172.66.43.7 |
| AAAA | 2606:4700:3108::ac42:2b07, 2606:4700:3108::ac42:28f9 |
| CNAME | — |
| NS | — |
| MX | — |
| TXT | — |
| CAA | Lookup not available with standard resolver |
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)
ARedirect Chain1 redirect(s), 224 ms totalPASS
https://www.clickhouse.com
62 ms · HTTP/1.1
https://clickhouse.com/
161 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://www.clickhouse.com | 302 | 62 ms | HTTP/1.1 | cloudflare |
| 2 | https://clickhouse.com/ | 200 | 161 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
If permanent, use 301 instead.
302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.
Learn more ▾ ▴
Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).
Source: Google Search Central
A+IPv6 ReadinessIPv6 reachable (16 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 2209 URLsPASS
User-agent: *
Allow: /
Disallow: /admin/
Disallow: /marketo-forms/
Sitemap: https://clickhouse.com/sitemap.xml
A+Domain Intelligenceclickhouse.com — via Squarespace Domains II LLC, 27 years, 5 months oldPASS
2069 days
March 12, 2032
88 days
Issued by Let's Encrypt
27 years, 5 months
Registered March 12, 1999
Not enabled
Protects against DNS spoofing
Unknown
2606:4700:3108::ac42:28f9
Squarespace Domains II LLC
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033