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Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
66
GRADE
D
FIX
4
REVIEW
9
PASS
3
INFO
1
Probed from Santa Clara, United States
200 OK
Checks
17
3 PASS 9 REVIEW 4 FIX
F
Multi-Resolver DNS Speed
Action
All public resolvers failed to resolve the domain
FIX
All public resolvers failed to resolve the domain
Critical::
DNS resolution failed against all public resolvers
1.1.1.1, 8.8.8.8, and 9.9.9.9 all failed to resolve this domain. Almost always means the domain is delegated incorrectly, the authoritative servers are unreachable, or the resolution returned NXDOMAIN/SERVFAIL across the board.
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2a01:448:4005::31
Info::
IPv6 connection error
Got: dial tcp6 [2a01:448:4005::31]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2a01:448:4005::31 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

F
HTTP Probe Timing
Action
Total 16897 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
FIX
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
39 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
143 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
145 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
16.75 s
Total Time Total request time from DNS lookup through full response.
16.90 s

Connection waterfall

DNS Lookup 39 ms TCP Connect 143 ms TLS Handshake 145 ms Server Processing 16.43 s Content Transfer 143 ms
D
CDN & Delivery
Action
No CDN (document or assets)
FIX
No CDN (document or assets)
Warning::
No CDN (document or assets)
Neither the HTML document nor the page's subresources are served through an edge network. A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN (document or assets)

Consider using a CDN to improve global delivery speed and reduce origin load.

C
DNSSEC
Action
DNSSEC posture not checked
REVIEW
DNSSEC posture not checked
Info::
DNSSEC posture not checked
Could not query the validating resolver for DNSSEC status. Network or resolver outage.
C
CAA Records
Action
CAA posture not checked
REVIEW
CAA posture not checked
Info::
CAA records not checked
Could not query the resolver for CAA records. Network or resolver outage.
B
Reverse DNS
0/2 IPs match cert SAN
REVIEW
0/2 IPs match cert SAN
Info::
PTR for 194.213.127.31 does not match any cert SAN: server071.mijndomeinhosting.nl
Common when behind a CDN or shared hosting (PTR points at the provider's hostname). Mismatch can also affect mail deliverability if this IP sends email -- many MTAs reject mail when forward+reverse DNS disagree.
Info::
PTR for 2a01:448:4005::31 does not match any cert SAN: server071.mijndomeinhosting.nl
Common when behind a CDN or shared hosting (PTR points at the provider's hostname). Mismatch can also affect mail deliverability if this IP sends email -- many MTAs reject mail when forward+reverse DNS disagree.
B
Crawlability
no robots.txt, no sitemap
REVIEW
no robots.txt, no sitemap
Info::
No robots.txt found
robots.txt is optional but recommended. It tells search engine crawlers which pages to index.
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.

robots.txt is optional but recommended. It tells search engine crawlers which pages to index.

Why this matters

No robots.txt — crawlers fetch /robots.txt and get 404; not breaking but means default crawl behavior with no directives or sitemap reference.

Learn more ▾

A minimal robots.txt with `User-agent: * / Allow: / / Sitemap: https://example.com/sitemap.xml` covers the basics. Without it, crawlers behave fine but lose the sitemap signal and can't be selectively blocked from crawl-traps.

Source: robotstxt.org

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more ▾

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

robots.txt No robots.txt found

No robots.txt found

This is fine for most sites — a missing robots.txt allows all crawling by default.

sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
HTTP version does not redirect to HTTPS
Got: HTTP 0 Expected: 301 redirect to HTTPS

www / non-www

https://www.biermetstijl.com/
200https://biermetstijl.com/

HTTP → HTTPS

http://biermetstijl.com/

HTTP version does not redirect to HTTPS

B
TLS Certificate Expiry & Recommendations
45 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

45
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 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: connection error, /health: connection error, /healthz: connection error, /ping: connection error, /status: connection error.
A
DNS Records
1 A records, 212 ms lookup
PASS
1 A records, 212 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 194.213.127.31
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 2a01:448:4005::31
Info::
2 nameserver(s) configured
Got: nsn1.mijndomein.nl, nsn2.mijndomein.nl
Info::
2 mail exchanger(s) configured
Info::
SPF record present in TXT
Warning::
DNS resolution is slow (212 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 212 ms
A194.213.127.31
AAAA2a01:448:4005::31
CNAME—
NSnsn1.mijndomein.nl, nsn2.mijndomein.nl
MX
5 mx1.mijndomein.nl
6 mx2.mijndomein.nl
TXT
SPF v=spf1 a mx include:spf.mijndomeinhosting.nl ~all
CAALookup not available with standard resolver
Resolved in 212 ms

Multiple A records provide failover if one server goes down.

Why this matters

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

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A+
Redirect Chain
No redirect data available
PASS
No redirect data available
Info::
No redirect data captured
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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