Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations202 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
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
A+DNS Records1 A records, 82 ms lookupPASS
| A | 129.70.240.4 |
| AAAA | — |
| CNAME | — |
| NS | ns2.uni-bielefeld.de, dns-2.dfn.de, ns1.uni-bielefeld.de |
| MX | 50 a2631.mx.srv.dfn.de 50 c2631.mx.srv.dfn.de 50 b2631.mx.srv.dfn.de |
| TXT | google-site-verification=T5xNbHbPGhlsAAVo-jhf9bCnqHu--GISvf6fh4J2GDs adobe-idp-site-verification=3d1e550ccbef00ecf478dfb339156a49d8b78166961a42320ece... SPF v=spf1 ip4:129.70.4.0/24 ip4:129.70.204.0/24 ip4:129.70.208.0/24 ip4:129.70.43.1... sendinblue-code:a35d677f130498f670bd551fe31ae3f4 apple-domain-verification=t4s8f87S8M1zYndy mindmanager-verification=c59b5cfe5aa2bef46104537a9486abf3237366c8074a1a14a3bf784... HARICA-fRmzbLAdUxAk4G981UI MS=8764D5ABE038806624DD4192154D0344B26D3419 |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
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
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.
ARedirect Chain1 redirect(s), 743 ms totalPASS
https://uni-bielefeld.de
118 ms · HTTP/1.1
https://www.uni-bielefeld.de/
624 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://uni-bielefeld.de | 301 | 118 ms | HTTP/1.1 | Roxen/6.1.248-r5 |
| 2 | https://www.uni-bielefeld.de/ | 200 | 624 ms | HTTP/1.1 | Roxen/6.1.248-r5 |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 13773 URLsPASS
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
User-agent: *
Disallow: /*/cgi/
Disallow: /edit/
Disallow: *?__xsl=*.xsl
Disallow: /*.xsl
Disallow: /schulung/*
Disallow: /themen/testseite/*
Disallow: /ub/_intern/*
Disallow: /uni/einrichtungen-organisation/rektorat/rektoratsmitglieder/*
Disallow: /_internal/
Allow: /_internal/cimg*
Disallow: /cgi-bin/
Disallow: /Universitaet/*
Disallow: /(de)/*
Disallow: /(en)/*
Disallow: /<-en,de>/*
Disallow: /<en>/*
Disallow: /<de>/*
Disallow: /<-en>/*
Disallow: /<-de>/*
User-agent: SemrushBot
Disallow: /*
User-agent: SemrushBot-BA
Disallow: /*
User-agent: MJ12bot
Disallow: /*
- https://www.uni-bielefeld.de/uni/einrichtungen-organisation/zentrale-organisation/vertretungen-beauftragte/mittelbaurat/
- https://www.uni-bielefeld.de/fakultaeten/psychologie/studium/ansprechpartner/
- https://www.uni-bielefeld.de/fakultaeten/psychologie/studium/ansprechpartner/studienberatung/studienberatung/
- https://www.uni-bielefeld.de/forschung/profil/fokusbereiche/reflect/
- https://www.uni-bielefeld.de/uni/einrichtungen-organisation/grace/pep/fortbildung/
A+Domain Intelligenceuni-bielefeld.de — hosted on DFN Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DEPASS
Unknown
202 days
Issued by Hellenic Academic and Research Institutions CA
Unknown
Status unknown
Protects against DNS spoofing
DFN Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE
ASN AS680
129.70.240.4
Registrar unknown
Expiry timeline
Recommended actions
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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.
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