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https://math-kit.pages.dev

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
91
GRADE
A
FIX
0
REVIEW
8
PASS
8
INFO
1
Probed from Madrid, Spain
200 OK
Checks
17
8 PASS 8 REVIEW
B
DNSSEC
Unsigned (DNSSEC not deployed)
REVIEW
Unsigned (DNSSEC not deployed)
Info::
DNSSEC is not deployed
The zone is not DNSSEC-signed. Users on validating resolvers (Cloudflare 1.1.1.1, Quad9 9.9.9.9, growing default in mobile resolvers) get no protection against DNS spoofing for this domain. Most registrars now offer DNSSEC at a single click; consider enabling it for sites where authenticity matters (banking, healthcare, government).
B
CAA Records
No CAA records (any CA may issue certificates)
REVIEW
No CAA records (any CA may issue certificates)
Info::
No CAA records published
Without CAA records, any publicly-trusted CA can issue certificates for this domain. Adding a CAA record (`yourdomain. IN CAA 0 issue "letsencrypt.org"`) restricts issuance to CAs you authorize. Required by CAB Forum baseline since 2017; the default of 'any CA' is widely supported but is the broader attack surface for issuance fraud.
C
Reverse DNS
Action
0/4 IPs match cert SAN
REVIEW
0/4 IPs match cert SAN
Info::
PTR lookup failed for 172.66.47.164: lookup 172.66.47.164: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
Info::
PTR lookup failed for 172.66.44.92: lookup 172.66.44.92: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
Info::
PTR lookup failed for 2606:4700:310c::ac42:2c5c: lookup 2606:4700:310c::ac42:2c5c: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
Info::
PTR lookup failed for 2606:4700:310c::ac42:2fa4: lookup 2606:4700:310c::ac42:2fa4: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
B
TLS Certificate Expiry & Recommendations
71 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

71
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • 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
B
CDN & Delivery
Cloudflare Pages
REVIEW
Cloudflare Pages
Info::
Document is served via Cloudflare Pages CDN
Got: delegation math-kit.pages.dev
Document served via CDN: Cloudflare Pages
Provider Cloudflare Pages Evidence delegation math-kit.pages.dev
B
CDN Cache Observability
No CDN cache-status headers in the response
REVIEW
No CDN cache-status headers in the response
Info::
No CDN cache-status headers in the response
Without an X-Cache / CF-Cache-Status / X-Vercel-Cache / Age header, you can't tell from outside whether a request hit the cache or went to origin. Operationally important: enables debugging stale-content reports and verifying cache rules. Most managed CDN platforms emit at least one of these by default; absence often means the platform's diagnostic headers are stripped at an upstream proxy.
B
Operational Status Page
No status page link detected
REVIEW
No status page link detected
Info::
No operational status page link detected
Status pages communicate planned maintenance and incidents to users -- a hallmark of operationally-mature services. Most SaaS teams publish one via Atlassian Statuspage, Instatus, BetterUptime, or a self-hosted Cachet. Smaller sites legitimately don't need one; flagged as Info, not a failure.
B
Health Check Endpoint
No conventional health endpoint found
REVIEW
No conventional health endpoint found
Info::
No conventional health endpoint found
Health endpoints (/health, /healthz, /status, /ping, /api/health) let uptime monitors, load balancers, and orchestration systems (Kubernetes, ECS, Fly.io) verify the service is alive. Marketing sites and small services often skip them legitimately; flagged as Info, not a failure. Probe results: /api/health: 404, /health: 404, /healthz: 404, /ping: 404, /status: 404.
A+
DNS Records
2 A records, 49 ms lookup
PASS
2 A records, 49 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 172.66.47.164, 172.66.44.92
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:310c::ac42:2c5c, 2606:4700:310c::ac42:2fa4
Info::
2 nameserver(s) configured
Got: gordon.ns.cloudflare.com, dana.ns.cloudflare.com
Info::
No MX records — email not configured via DNS
Info::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 49 ms
Got: 49 ms
A172.66.47.164, 172.66.44.92
AAAA2606:4700:310c::ac42:2c5c, 2606:4700:310c::ac42:2fa4
CNAME—
NSgordon.ns.cloudflare.com, dana.ns.cloudflare.com
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 49 ms

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

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+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A+
Multi-Resolver DNS Speed
Mean 24ms across 3 resolvers (spread 16ms)
PASS
Mean 24ms across 3 resolvers (spread 16ms)
Info::
Quad9: 14ms
Got: 14ms via 9.9.9.9:53
Info::
Cloudflare: 29ms
Got: 29ms via 1.1.1.1:53
Info::
Google: 30ms
Got: 30ms via 8.8.8.8:53
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://math-kit.pages.dev

https://math-kit.pages.dev

123 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://math-kit.pages.dev200123 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2606:4700:310c::ac42:2c5c, 2606:4700:310c::ac42:2fa4
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700:310c::ac42:2c5c, 2606:4700:310c::ac42:2fa4 Connection Reachable (17 ms)
A+
Crawlability
robots.txt present, sitemap with 1 URLs
PASS
robots.txt present, sitemap with 1 URLs
Info::
robots.txt is present
Got: 78 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1 entries
Info::
Sitemap index with 1 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 78 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /

Sitemap: https://math-kit.pages.dev/sitemap-index.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 1 entries Valid XML Yes
Child Sitemaps:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly redirects to HTTPS permanently
Got: HTTP 301

www / non-www

302https://www.math-kit.pages.dev/
200https://math-kit.pages.dev/

Preferred variant: non-www

HTTP → HTTPS

301http://math-kit.pages.dev/ → https://math-kit.pages.dev/

Consistent

A+
HTTP Probe Timing
Total 202 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
51 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
17 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
33 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
201 ms
Total Time Total request time from DNS lookup through full response.
202 ms

Connection waterfall

DNS Lookup 51 ms TCP Connect 17 ms TLS Handshake 33 ms Server Processing 100 ms Content Transfer 1 ms
Domain Intelligence
Domain intelligence data not available
INFO
Domain intelligence data not available

RDAP and WHOIS lookup both failed

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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