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.
BCrawlabilityrobots.txt present, no sitemapREVIEW
A sitemap helps search engines discover and index your pages more efficiently.
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
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: /search
Disallow: /suche
Disallow: /*feed.xml
No sitemap found
Adding a sitemap helps search engines discover your pages.
CURL VariantsActionwww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Use 301 (permanent) instead of 302 (temporary)
BTLS Certificate Expiry & Recommendations59 days until leaf cert expires — 5 issues to addressREVIEW
Certificate validity
Recommended actions
- Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- 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, 21 ms lookupPASS
| A | 131.130.190.232 |
| AAAA | 2001:62a:4:72:131:130:190:232 |
| CNAME | — |
| NS | ns3.univie.ac.at, ns4.univie.ac.at, ns5.univie.ac.at, ns8.univie.ac.at, ns10.univie.ac.at |
| MX | 10 zidmx1.univie.ac.at 10 zidmx2.univie.ac.at 10 zidmx4.univie.ac.at 10 zidmx3.univie.ac.at |
| TXT | 3sr-m7d-ca4 Domain of the University of Vienna apple-domain-verification=5XMTOamGOlQoUGxN SPF v=spf1 include:_spf.univie.ac.at include:_massmailspf.univie.ac.at ~all adobe-idp-site-verification=5261d467368b667123b2fba4eab5fe2b34a217eb93cd0d7b9148... successfactors-site-verification=Yjg0ZTY2MGY5NTU0ZjVmODFiMzZiMzhiN2FhYTkyYmE5YmN... |
| 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), 242 ms totalPASS
https://univie.ac.at
88 ms · HTTP/1.1
https://www.univie.ac.at/
153 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://univie.ac.at | 301 | 88 ms | HTTP/1.1 | Apache |
| 2 | https://www.univie.ac.at/ | 200 | 153 ms | HTTP/1.1 | Apache |
See the visual redirect chain in the HTTP Probe tab →
A+IPv6 ReadinessIPv6 reachable (18 ms)PASS
A+Domain Intelligenceunivie.ac.atPASS
Unknown
59 days
Issued by Hellenic Academic and Research Institutions CA
Unknown
Status unknown
Protects against DNS spoofing
Unknown
2001:62a:4:72:131:130:190:232
Registrar unknown