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https://schalke04.de

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
8
PASS
9
INFO
0
Probed from Madrid, Spain
200 OK
Checks
17
9 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 104.20.40.87: lookup 104.20.40.87: 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 172.66.153.234: lookup 172.66.153.234: 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 2606:4700:10::ac42:99ea: lookup 2606:4700:10::ac42:99ea: 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 2606:4700:10::6814:2857: lookup 2606:4700:10::6814:2857: 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
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
TLS Certificate Expiry & Recommendations
88 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

88
days left
0d 30d 60d 90d+

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
B
CDN & Delivery
Cloudflare (BYPASS)
REVIEW
Cloudflare (BYPASS)
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: a23ef2424e9ed477-CDG
Info::
CDN cache status: BYPASS
CDN Detected: Cloudflare
Provider Cloudflare Cache Status BYPASS Evidence cf-ray: a23ef2424e9ed477-CDG
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, 44 ms lookup
PASS
2 A records, 44 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.20.40.87, 172.66.153.234
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:10::ac42:99ea, 2606:4700:10::6814:2857
Info::
2 nameserver(s) configured
Got: noel.ns.cloudflare.com, iris.ns.cloudflare.com
Info::
2 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 44 ms
Got: 44 ms
A104.20.40.87, 172.66.153.234
AAAA2606:4700:10::ac42:99ea, 2606:4700:10::6814:2857
CNAME—
NSnoel.ns.cloudflare.com, iris.ns.cloudflare.com
MX
10 mx01.schalke04.de
20 mforward.dtag.de
TXT
facebook-domain-verification=rt74f2g9ugo2vdwxr5ujpm8o3a5svv
ns.udag.net. hostmaster.united-domains.de 2017121901
00D1x0000000MVy=1TB9K0000000VAH
google-site-verification=wf8INi4HMactEgffQYH6jo2-uelLv4-fBhFfHD7B0ik
google-site-verification=TXfRkz-kLk8iFBK3xy9Y_RCy3NYD0vR1VQ9D5x_YVKA
google-site-verification=yiotsynVQ_NlOmTIzlA4GL9KZeBtQwIjdgILGuipdB0
apple-domain-verification=aNMdyD1ja1eZeneh
MS=ms17506156
_globalsign-domain-verification=6AFCpDybJa_TfSfZ78ggwl025E_gy5OoqUpgFA4XzW
MS=ms80176648
google-site-verification=8SnTuZ7utt00e3hHjWsSGEWN5766h2iUW4m1d7gDcQQ
cisco-ci-domain-verification=882d7b9bd873628dc2208c1988de5b5a21572a4b7ecebde337c...
SPF v=spf1 mx include:spf.mailjet.com include:aspmx.pardot.com include:_spf.salesfor...
rZZZRH6smdfnd0BhzxztYysKfhMz9wcWyhvwQ18R9flFytnUWXfORim8ecv0eRBUz6IVhPtCBk40JjLL...
0367BD625F518442EC1755A2D04A3DA4B852D616
MS=ms76559451
CAALookup not available with standard resolver
Resolved in 44 ms
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 21ms across 3 resolvers (spread 10ms)
PASS
Mean 21ms across 3 resolvers (spread 10ms)
Info::
Cloudflare: 17ms
Got: 17ms via 1.1.1.1:53
Info::
Quad9: 20ms
Got: 20ms via 9.9.9.9:53
Info::
Google: 27ms
Got: 27ms 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://schalke04.de

https://schalke04.de

103 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://schalke04.de200103 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2606:4700:10::ac42:99ea, 2606:4700:10::6814:2857
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700:10::ac42:99ea, 2606:4700:10::6814:2857 Connection Reachable (17 ms)
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 301-redirects to HTTPS

www / non-www

302https://www.schalke04.de/
200https://schalke04.de/

Preferred variant: non-www

HTTP → HTTPS

301http://schalke04.de/ → https://schalke04.de/

Consistent

A+
Domain Intelligence
schalke04.de
PASS
schalke04.de
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Domain expiry

Unknown

SSL certificate

88 days

Issued by Let's Encrypt

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2606:4700:10::6814:2857

Registrar

Registrar unknown

Unlocked Name servers unknown
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar
Hosting
IP Address 2606:4700:10::6814:2857
Data source: whois (0.6s)

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 143 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
35 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.
26 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
138 ms
Total Time Total request time from DNS lookup through full response.
143 ms

Connection waterfall

DNS Lookup 35 ms TCP Connect 17 ms TLS Handshake 26 ms Server Processing 60 ms Content Transfer 6 ms
A+
CDN Cache Observability
Cache state: BYPASS
PASS
Cache state: BYPASS
Info::
CDN cache state observable via 1 header(s)
Got: cf-cache-status=BYPASS
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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