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https://utwente.nl

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
4 PASS 4 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.

B
Redirect Chain
1 redirect(s), 2345 ms total
REVIEW
1 redirect(s), 2345 ms total
Info::
Single redirect
Got: https://utwente.nl → https://www.utwente.nl/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 2345 ms total
Got: 2345 ms

https://utwente.nl

958 ms · HTTP/1.1

301

https://www.utwente.nl/

1387 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://utwente.nl301958 msHTTP/1.1nginx
2https://www.utwente.nl/2001387 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

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.utwente.nl/
200https://utwente.nl/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://utwente.nl/ → https://utwente.nl/

Consistent

B
HTTP Probe Timing
Total 966 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
180 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
259 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
268 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
967 ms
Total Time Total request time from DNS lookup through full response.
967 ms

Connection waterfall

DNS Lookup 180 ms TCP Connect 259 ms TLS Handshake 268 ms Server Processing 260 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
261 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

261
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 OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A
DNS Records
1 A records, 370 ms lookup
PASS
1 A records, 370 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 130.89.12.12
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 2001:67c:2564:a429::1:3
Info::
3 nameserver(s) configured
Got: ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl
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
Warning::
DNS resolution is slow (370 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 370 ms
A130.89.12.12
AAAA2001:67c:2564:a429::1:3
CNAME—
NSns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl
MX
10 utwente-nl.mail.protection.outlook.com
TXT
zoom=7028454
MS=ms81740447
HARICA-hnFHSkoSdDb6unc2MPW
apple-domain-verification=9EPP8F0catSA9f0O
jamf-site-verification=MLXEZVYv2Br3Ijb9khXZUg
jetbrains-domain-verification=dhhwkvidedf2d3pw0fh8su5n4
google-site-verification=PgdRqkGsaQx528wE-tmmMPjyDyDr1-0Vh6cqnNcodCs
1JOvDu30lTiTvWtC3iF9D8zs+IKjCWUq6i6LFch8630FBRBvpcS5e90hIXNNoDIqPiyVvmjiwIbHDorI...
Wr3KIzpc3tUeVW9RvqJ5QjywoV0ZwD3Qi+Mxxat1658ZHjDm0xm4otFa2NkqKPivylclLFa6GH+CdxXJ...
atlassian-domain-verification=xp1mabSduKWq9tjJUyknw1zcvZPybL5NINb3aVBWFOLsPjqRXH...
SPF v=spf1 mx a:smtppool.utwente.nl ip4:52.17.45.98 ip4:52.16.190.81 ip4:54.229.2.16...
CAALookup not available with standard resolver
Resolved in 370 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.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A+
IPv6 Readiness
IPv6 reachable (161 ms)
PASS
IPv6 reachable (161 ms)
Info::
IPv6 is configured and reachable at 2001:67c:2564:a429::1:3
Got: 161 ms connect
IPv6 Ready
AAAA Records 2001:67c:2564:a429::1:3 Connection Reachable (161 ms)
A+
Crawlability
robots.txt present, sitemap with 2 URLs
PASS
robots.txt present, sitemap with 2 URLs
Info::
robots.txt is present
Got: 298 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 2 entries
Info::
Sitemap index with 2 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 298 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /repository/utwente/
Disallow: /*/intern/
Disallow: /*/internal/
Disallow: /*/intra/
Disallow: /*/intranet/
Disallow: /*/test/
Disallow: /*/temp/
Disallow: /*/widgets/
Disallow: /*/footer/
Sitemap: https://www.utwente.nl/repository/utwente-data/sitemap/public/sitemap-index.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 2 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
utwente.nl — via Universiteit Twente, 40 years, 1 months old
PASS
utwente.nl — via Universiteit Twente, 40 years, 1 months old
Info::
DNSSEC is enabled
Info::
Registrar: Universiteit Twente
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

261 days

Issued by Hellenic Academic and Research Institutions CA

Domain age

40 years, 1 months

Registered October 16, 1986

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2001:67c:2564:a429::1:3

Registrar

Universiteit Twente

Unlocked 3 NS records
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Universiteit Twente
Created October 16, 1986 (40 years, 1 months ago)
Last Updated November 3, 2020
Name Servers ns2.utwente.nl, ns1.utwente.nl, ns3.utwente.nl
DNSSEC Enabled
Registrant Universiteit Twente
Hosting
IP Address 2001:67c:2564:a429::1:3
Data source: rdap (1.6s)

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

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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