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https://uu.nl

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
2
PASS
5
INFO
0
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
5 PASS 2 REVIEW 2 FIX
D
URL Variants
Action
www/non-www, trailing slash, HTTP→HTTPS
FIX
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
Critical::
HTTP version does not redirect to HTTPS
Got: HTTP 0 Expected: 301 redirect to HTTPS

www / non-www

200https://www.uu.nl/
200https://uu.nl/

Inconsistent — duplicate content risk

HTTP → HTTPS

http://uu.nl/

HTTP version does not redirect to HTTPS

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), 1199 ms total
REVIEW
1 redirect(s), 1199 ms total
Info::
Single redirect
Got: https://uu.nl → https://www.uu.nl/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1199 ms total
Got: 1199 ms

https://uu.nl

736 ms · HTTP/1.1

301

https://www.uu.nl/

463 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://uu.nl301736 msHTTP/1.1
2https://www.uu.nl/200463 msHTTP/1.1Apache

See the visual redirect chain in the HTTP Probe tab →

B
TLS Certificate Expiry & Recommendations
197 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

197
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A
DNS Records
1 A records, 1026 ms lookup
PASS
1 A records, 1026 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 83.217.76.86
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: 2a00:1c98:10:25::84
Info::
4 nameserver(s) configured
Got: ns1.zurich.surf.net, ns1.surfnet.nl, azie.net.uu.nl, australie.net.uu.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 (1026 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 1026 ms
A83.217.76.86
AAAA2a00:1c98:10:25::84
CNAME—
NSns1.zurich.surf.net, ns1.surfnet.nl, azie.net.uu.nl, australie.net.uu.nl
MX
0 uu-nl.mail.protection.outlook.com
TXT
MS=ms59510356
faxination=fen44162647
HARICA-qgr0NyZthcl3PvsrBJ5
00D7Q000006uk9x=1TBQs00000007Sx
apple-domain-verification=wydMRl66PAsBwOVk
brevo-code:af27a511cfadd67db014e628614c7404
bw=oqt3PIuXcjotJ6dvsl4A4bDskSdkcc56EiFM1AAAvZG3
autodesk-domain-verification=RfCX8IHaalDkeE1T-2PE
v=easydus; cg=4b46d154-7e0f-4088-8f50-0a0638724512
google-site-verification=K3bIDuPg2RhRc-qYqyEau7MUnp3aN4oIM_6rWDe1M34
atlassian-sending-domain-verification=72791b6c-e695-4116-8bbc-dd41675e5b98
pardot997561=644046e4432766fb73dbc13a959693022e9e4bdeebddbd369e6a7603dc62aafa
QTXhE9VligPDA5a2xw9zRjxg01lC8iPwj7ouX3LnksdJltyh26E0WnV/t78xAeBXBb+8OJoWhfRRCJET...
WLgjk988Kp7Qba9XFltAfkL2Toa2uc3OdjwkPdG8qI4iNXGc14jtd3MM7kC70OPfYW0cWVz5mHMuv5ja...
adobe-idp-site-verification=1f7a24c74c7d57187943e2d4ec7adcd37d3725b9a3a7d5857dd4...
cisco-ci-domain-verification=5842c46b62263bd02abd37a7754654a4dff107f06a2b66a8477...
atlassian-domain-verification=0iPg6zRItjFaaj30LVQ0AjAJ4N66NNbKdP5fnJ0H6Qg9optMLX...
signrequest-domain-validation=40cdf51de7e51a3f84de9f6f8abd2a374aa3d89acb3d692700...
SPF v=spf1 ip4:131.211.14.0/24 ip4:145.0.1.0/24 ip4:195.169.13.0/24 ip6:2001:610:188...
CAALookup not available with standard resolver
Resolved in 1026 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 (153 ms)
PASS
IPv6 reachable (153 ms)
Info::
IPv6 is configured and reachable at 2a00:1c98:10:25::84
Got: 153 ms connect
IPv6 Ready
AAAA Records 2a00:1c98:10:25::84 Connection Reachable (153 ms)
A+
Crawlability
robots.txt present, sitemap with 9 URLs
PASS
robots.txt present, sitemap with 9 URLs
Info::
robots.txt is present
Got: 2084 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 9 entries
Info::
Sitemap index with 9 child sitemaps
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 2084 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed
#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used:    http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html

User-agent: *
# CSS, JS, Images
Allow: /core/*.css$
Allow: /core/*.css?
Allow: /core/*.js$
Allow: /core/*.js?
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/
Disallow: /profiles/
# Files
Disallow: /README.md
Disallow: /composer/Metapackage/README.txt
Disallow: /composer/Plugin/ProjectMessage/README.md
Disallow: /composer/Plugin/Scaffold/README.md
Disallow: /composer/Plugin/VendorHardening/README.txt
Disallow: /composer/Template/README.txt
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
Disallow: /web.config
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed

Disallow: /zoeken*
Disallow: /en/search*
Disallow: /*?*
sitemap.xml 200 OK
Type Sitemap Index URLs 9 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
uu.nl — via SURF B.V., 29 years, 5 months old
PASS
uu.nl — via SURF B.V., 29 years, 5 months old
Info::
DNSSEC is enabled
Info::
Registrar: SURF B.V.
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

197 days

Issued by Hellenic Academic and Research Institutions CA

Domain age

29 years, 5 months

Registered March 27, 1997

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2a00:1c98:10:25::84

Registrar

SURF B.V.

Unlocked 4 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 SURF B.V.
Created March 27, 1997 (29 years, 5 months ago)
Last Updated March 2, 2026
Name Servers australie.net.uu.nl, ns1.zurich.surf.net, azie.net.uu.nl, ns1.surfnet.nl
DNSSEC Enabled
Registrant Universiteit Utrecht
Hosting
IP Address 2a00:1c98:10:25::84
Data source: rdap (1.1s)

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

Connection waterfall

DNS Lookup 176 ms TCP Connect 158 ms TLS Handshake 163 ms Server Processing 158 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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