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https://tuwien.ac.at

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
2
PASS
6
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
6 PASS 2 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

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

C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

B
TLS Certificate Expiry & Recommendations
41 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

41
days left
0d 30d 60d 90d+

Recommended actions

  • 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 Records
1 A records, 56 ms lookup
PASS
1 A records, 56 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 128.130.35.76
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns10.univie.ac.at, ns5.univie.ac.at, tunamed.tuwien.ac.at, tunamec.tuwien.ac.at
Info::
4 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 56 ms
Got: 56 ms
A128.130.35.76
AAAA—
CNAME—
NSns10.univie.ac.at, ns5.univie.ac.at, tunamed.tuwien.ac.at, tunamec.tuwien.ac.at
MX
1 mri0.tuwien.ac.at
10 mri2.tuwien.ac.at
10 mri1.tuwien.ac.at
900 mri9.tuwien.ac.at
TXT
adobe-idp-site-verification=afbf75dd7597845013774456cb0d3b42cf25a1922bafd2984ca9...
mentimeter-c93dd37c-0fb0-419c-834e-a4fd93c53685
logmein-verification-code=1ca975e0-0f9d-4d5d-9a8f-696606c640e4
ZOOM_verify_yJyRZKhnSeaRjeGtMTxHbw
cisco-ci-domain-verification=66a018426aa929b3825bfb763c874d68eca9be27959d91aca1c...
SPF v=spf1 include:_spf.tuwien.ac.at ~all
MS=882D5EDE00960683C885B979C93441C1765FE5FF
atlassian-domain-verification=wMOS8eIWfYqMN/xzhirm3WqF8VvzeFo7iZmOR2ZHMDMMZtiQZ0...
google-site-verification=EIYEqVhR-tYiQyxCwy4xXP78Im9zNAe7NBr4yb77h30
logmein-verification-code=10e16f06-7860-4696-8bd1-e95d761da330
google-site-verification=luUJNNWM1fC8pqbIIPtWDCEsEDLwCE6sw67Eh3JDrzo
CAALookup not available with standard resolver
Resolved in 56 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

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A
Redirect Chain
1 redirect(s), 449 ms total
PASS
1 redirect(s), 449 ms total
Info::
Single redirect
Got: https://tuwien.ac.at → https://www.tuwien.at/ (301)
Info::
WWW normalization redirect
Info::
Cross-domain redirect detected

https://tuwien.ac.at

120 ms · HTTP/1.1

301

https://www.tuwien.at/

329 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://tuwien.ac.at301120 msHTTP/1.1
2https://www.tuwien.at/200329 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 15 URLs
PASS
robots.txt present, sitemap with 15 URLs
Info::
robots.txt is present
Got: 285 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 15 entries
Info::
Sitemap index with 15 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 285 B Sitemaps referenced 2 User-agents TurnitinBot, * Blocking No — crawling allowed
User-agent: TurnitinBot

Disallow: /


User-agent: *

Disallow: /fileadmin/_temp_/

Disallow: /typo3/

Disallow: /typo3conf/

Allow: /typo3/sysext/frontend/Resources/Public/*

Sitemap: https://www.tuwien.at/sitemap.xml

Sitemap: https://www.tuwien.at/en/sitemap.xml


Disallow: /404/
sitemap.xml 200 OK
Type Sitemap Index URLs 15 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 301-redirects to HTTPS

www / non-www

301https://www.tuwien.ac.at/
200https://tuwien.ac.at/

Preferred variant: non-www

HTTP → HTTPS

301http://tuwien.ac.at/ → https://tuwien.ac.at/

Consistent

A+
Domain Intelligence
tuwien.ac.at — hosted on TUNET-AS Technische Universitaet Wien, AT
PASS
tuwien.ac.at — hosted on TUNET-AS Technische Universitaet Wien, AT
Info::
Hosting: TUNET-AS Technische Universitaet Wien, AT
Got: AS679
Domain expiry

Unknown

SSL certificate

41 days

Issued by Hellenic Academic and Research Institutions CA

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

TUNET-AS Technische Universitaet Wien, AT

ASN AS679

128.130.35.76

Registrar

Registrar unknown

Lock status unknown 4 NS records
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Registrar
Name Servers ns10.univie.ac.at, ns5.univie.ac.at, tunamec.tuwien.ac.at, tunamed.tuwien.ac.at
Registrant Technische Universitaet Wien - ZID
Hosting
IP Address 128.130.35.76
ASN AS679 (TUNET-AS Technische Universitaet Wien, AT)
Provider TUNET-AS Technische Universitaet Wien, AT
Data source: whois (0.9s)
A+
HTTP Probe Timing
Total 172 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
48 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
39 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
47 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
172 ms
Total Time Total request time from DNS lookup through full response.
172 ms

Connection waterfall

DNS Lookup 48 ms TCP Connect 39 ms TLS Handshake 47 ms Server Processing 39 ms Content Transfer 0 ms
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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