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https://svennouwen.nl

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
95
GRADE
A
FIX
1
REVIEW
6
PASS
9
INFO
1
Probed from Amsterdam, Netherlands
200 OK
Checks
17
9 PASS 6 REVIEW 1 FIX
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.

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.
B
Reverse DNS
0/2 IPs match cert SAN
REVIEW
0/2 IPs match cert SAN
Info::
PTR for 85.10.159.51 does not match any cert SAN: 85.10.159.51.nl.transip.me
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 lookup failed for 2a01:7c8:f0:1051:0:2:b5b8:8a6: lookup 2a01:7c8:f0:1051:0:2:b5b8:8a6: 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
35 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

35
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: 404, /health: 404, /healthz: 404, /ping: 404, /status: 404.
A+
DNS Records
1 A records, 27 ms lookup
PASS
1 A records, 27 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 85.10.159.51
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: 2a01:7c8:f0:1051:0:2:b5b8:8a6
Info::
3 nameserver(s) configured
Got: ns0.transip.net, ns1.transip.nl, ns2.transip.eu
Info::
3 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 27 ms
Got: 27 ms
A85.10.159.51
AAAA2a01:7c8:f0:1051:0:2:b5b8:8a6
CNAME—
NSns0.transip.net, ns1.transip.nl, ns2.transip.eu
MX
10 mx01.mail.icloud.com
10 mx02.mail.icloud.com
10 mx.transip.email
TXT
apple-domain=vuUA79nbbzRLv5zm
"v=spf1 include:icloud.com ~all"
SPF v=spf1 include:_spf.transip.email ~all
apple-domain-verification=kSF11FTH64wSPFtq
CAALookup not available with standard resolver
Resolved in 27 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

A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A+
DNSSEC
Signed and validating
PASS
Signed and validating
Info::
DNSSEC fully signed and chain validates (ECDSAP256SHA256)
A+
Multi-Resolver DNS Speed
Mean 9ms across 3 resolvers (spread 14ms)
PASS
Mean 9ms across 3 resolvers (spread 14ms)
Info::
Cloudflare: 2ms
Got: 2ms via 1.1.1.1:53
Info::
Google: 10ms
Got: 10ms via 8.8.8.8:53
Info::
Quad9: 16ms
Got: 16ms via 9.9.9.9:53
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://svennouwen.nl

https://svennouwen.nl

349 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://svennouwen.nl200349 msHTTP/1.1nginx
A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2a01:7c8:f0:1051:0:2:b5b8:8a6
Got: 1 ms connect
IPv6 Ready
AAAA Records 2a01:7c8:f0:1051:0:2:b5b8:8a6 Connection Reachable (1 ms)
A+
Crawlability
robots.txt present, sitemap with 1 URLs
PASS
robots.txt present, sitemap with 1 URLs
Info::
robots.txt is present
Got: 114 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 114 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php

Sitemap: https://svennouwen.nl/wp-sitemap.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

301https://www.svennouwen.nl/
200https://svennouwen.nl/

Preferred variant: non-www

HTTP → HTTPS

301http://svennouwen.nl/ → https://svennouwen.nl/

Consistent

A+
HTTP Probe Timing
Total 336 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
7 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
8 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
336 ms
Total Time Total request time from DNS lookup through full response.
337 ms

Connection waterfall

DNS Lookup 7 ms TCP Connect 1 ms TLS Handshake 8 ms Server Processing 319 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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