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https://dtu.dk

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
5 PASS 3 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
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.dtu.dk/
200https://dtu.dk/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://dtu.dk/ → https://dtu.dk/

Consistent

B
TLS Certificate Expiry & Recommendations
209 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

209
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
A+
DNS Records
1 A records, 61 ms lookup
PASS
1 A records, 61 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 52.236.166.178
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: dns1.dtu.dk, dns2.dtu.dk, dns3.dtu.dk, ns-soa.darenet.dk
Info::
1 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: 61 ms
Got: 61 ms
A52.236.166.178
AAAA—
CNAME—
NSdns1.dtu.dk, dns2.dtu.dk, dns3.dtu.dk, ns-soa.darenet.dk
MX
0 dtu-dk.mail.protection.outlook.com
TXT
0IABjjU09Gj6EJKvFxwwNlNZK3B0J89et3gh/qOG0aMenIHaqYipoaXoYk/jnM1kwRRxk9YnT8LCZIW7...
facebook-domain-verification=1mfoe26jx4bn398v31k3b4s29uumxf
have-i-been-pwned-verification=dweb_s2tfliyiesdp3xngokkr5n6d
google-site-verification=EvCzsCMkgSGV4vhVsWZEEQgbNTPef-aiT5ZdVsIfHW4
airtable-verification=5a0c5f55f684ae7fc38c13ddd173f974
HARICA-JmaZkRgnBy6L6MXYHV3
_0t7gtinct4a5l4wgimsiirfb4r8fnux
0SCk45pzO9J0Ox6MI8mbslpSbv3MxJKFwu0hHvlre8IhJ6GnWX1qSRj86QPbDvu4Cuu9njzporryvKoN...
SPF v=spf1 include:spf.dtu.dk ip4:94.231.107.25 ip4:94.231.107.21 ip4:93.90.115.122 ...
google-site-verification=_eUbQjq92YekXok6LWiZqWrnN5CEwRT8U3URLJu6eho
adobe-idp-site-verification=a30cc34b93b38cb8d91265eeac499919ede8fb873ba5b040ea79...
google-site-verification=ahlAcD_NZWyFCfDM9uALP8j76QccT0my3Gv123db8Xg
apple-domain-verification=tsBU81BHloQSgFUI
MS=ms14099746
CAALookup not available with standard resolver
Resolved in 61 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
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://dtu.dk

https://dtu.dk

264 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://dtu.dk200264 msHTTP/1.1Microsoft-IIS/10.0
A+
Crawlability
robots.txt present, sitemap with 457 URLs
PASS
robots.txt present, sitemap with 457 URLs
Info::
robots.txt is present
Got: 1855 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 457 entries
Info::
Sitemap index with 457 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 1855 B Sitemaps referenced 4 User-agents *, ClaudeBot, GPTBot, GoogleOther Blocking No — crawling allowed
User-agent: *

Disallow: /sitecore/

Disallow: /sitecore modules/

Disallow: /layouts/

Disallow: /upload/

Disallow: /english/sitecore/

Disallow: /dtu/

Disallow: /institutter/

Disallow: /centre/

Disallow: /sites/ 

Disallow: /subsites/

Disallow: /andre_universitetsenheder/

Disallow: /andre/

Disallow: /webservice/

Disallow: /functions/

Disallow: /resultat

Disallow: /english/resultat

Sitemap: https://www.dtu.dk/sitemap.xml

Crawl-delay: 10

User-agent: ClaudeBot

Disallow: /sitecore/

Disallow: /sitecore modules/

Disallow: /layouts/

Disallow: /upload/

Disallow: /english/sitecore/

Disallow: /dtu/

Disallow: /institutter/

Disallow: /centre/

Disallow: /sites/ 

Disallow: /subsites/

Disallow: /andre_universitetsenheder/

Disallow: /andre/

Disallow: /webservice/

Disallow: /functions/

Disallow: /resultat

Disallow: /english/resultat

Sitemap: https://www.dtu.dk/sitemap.xml

Crawl-delay: 1000

User-agent: GPTBot

Disallow: /sitecore/

Disallow: /sitecore modules/

Disallow: /layouts/

Disallow: /upload/

Disallow: /english/sitecore/

Disallow: /dtu/

Disallow: /institutter/

Disallow: /centre/

Disallow: /sites/ 

Disallow: /subsites/

Disallow: /andre_universitetsenheder/

Disallow: /andre/

Disallow: /webservice/

Disallow: /functions/

Disallow: /resultat

Disallow: /english/resultat

Sitemap: https://www.dtu.dk/sitemap.xml

Crawl-delay: 1000

User-agent: GoogleOther

Disallow: /sitecore/

Disallow: /sitecore modules/

Disallow: /layouts/

Disallow: /upload/

Disallow: /english/sitecore/

Disallow: /dtu/

Disallow: /institutter/

Disallow: /centre/

Disallow: /sites/ 

Disallow: /subsites/

Disallow: /andre_universitetsenheder/

Disallow: /andre/

Disallow: /webservice/

Disallow: /functions/

Disallow: /resultat

Disallow: /english/resultat

Sitemap: https://www.dtu.dk/sitemap.xml

Crawl-delay: 1000
sitemap.xml 200 OK
Type Sitemap Index URLs 457 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
dtu.dk — 28 years, 6 months old, hosted on Microsoft Azure
PASS
dtu.dk — 28 years, 6 months old, hosted on Microsoft Azure
Info::
Domain registered until Mar 31, 2027 (11 months remaining)
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.
Info::
Hosting: Microsoft Azure
Got: AS8075
Domain expiry

257 days

March 31, 2027

SSL certificate

209 days

Issued by Hellenic Academic and Research Institutions CA

Domain age

28 years, 6 months

Registered March 16, 1998

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Microsoft Azure

ASN AS8075

52.236.166.178

Registrar

Registrar unknown

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar
Created March 16, 1998 (28 years, 6 months ago)
Expires March 31, 2027 (11 months)
Name Servers dns1.dtu.dk, dns2.dtu.dk, dns3.dtu.dk, ns-soa.darenet.dk
Hosting
IP Address 52.236.166.178
ASN AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US)
Provider Microsoft Azure
Data source: whois (0.7s)

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 333 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
60 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
29 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
31 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
333 ms
Total Time Total request time from DNS lookup through full response.
333 ms

Connection waterfall

DNS Lookup 60 ms TCP Connect 29 ms TLS Handshake 31 ms Server Processing 211 ms Content Transfer 1 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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