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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
77
GRADE
C
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Santa Clara, United States
301 Moved Permanently
Checks
9
4 PASS 4 REVIEW 1 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2001:6b0:16:1:0:1000:3:12
Info::
IPv6 connection error
Got: dial tcp6 [2001:6b0:16:1:0:1000:3:12]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2001:6b0:16:1:0:1000:3:12 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

B
Redirect Chain
1 redirect(s), 1986 ms total
REVIEW
1 redirect(s), 1986 ms total
Info::
Single redirect
Got: https://lu.se → https://www.lu.se/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1986 ms total
Got: 1986 ms

https://lu.se

837 ms · HTTP/1.1

301

https://www.lu.se/

1150 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://lu.se301837 msHTTP/1.1Apache
2https://www.lu.se/2001150 msHTTP/1.1Apache

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.lu.se/
200https://lu.se/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://lu.se/ → https://lu.se/

Consistent

B
HTTP Probe Timing
Total 835 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
168 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
165 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
336 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
835 ms
Total Time Total request time from DNS lookup through full response.
835 ms

Connection waterfall

DNS Lookup 168 ms TCP Connect 165 ms TLS Handshake 336 ms Server Processing 166 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
57 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

57
days left
0d 30d 60d 90d+

Recommended actions

  • Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
  • 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, 168 ms lookup
PASS
1 A records, 168 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 130.235.138.12
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: 2001:6b0:16:1:0:1000:3:12
Info::
3 nameserver(s) configured
Got: nsa.lu.se, nsc.lu.se, sunic.sunet.se
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: 168 ms
Got: 168 ms
A130.235.138.12
AAAA2001:6b0:16:1:0:1000:3:12
CNAME—
NSnsa.lu.se, nsc.lu.se, sunic.sunet.se
MX
0 lu-se.mail.protection.outlook.com
TXT
abuseipdb-verification=bUg1lGmI
El9yR3eabYpwgNJorx23IEO8qsKpRzS6dLb6h1kVcXrYZ/UpWJZhDniDmvO6xdU+tc+EISsLq6VohY+b...
mentimeter-2b66e9cb-6b3a-4ae9-9e13-62f97fb0b467
lime-domain-verification=E7CA5BBE24741BE
ZOOM_verify_71xEjSFmXL1klaslMswmWu
SPF v=spf1 include:spf-lu.lu.se -all
google-site-verification=-bC64sWbBwlckSTyveDHF6phIlDXRekZSsYawWFfON8
autodesk-domain-verification=keCxrRvTadPDqXpFdCqq
adobe-idp-site-verification=fb4cb710b2423e840a12d44234f26c542bc1d70f27b16cba8802...
CAALookup not available with standard resolver
Resolved in 168 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+
Crawlability
robots.txt present, sitemap with 2 URLs
PASS
robots.txt present, sitemap with 2 URLs
Info::
robots.txt is present
Got: 10240 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 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 10240 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

# Search
Disallow: /search/
Disallow: /lubas/courses-programmes/
Disallow: /lubas/programs/
Disallow: /studera/kurser-program/
Disallow: /study/courses-programmes/

# Disallow all on index.php
Disallow: /index.php
Disallow: /index.php/

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

# Disallow all on index.php
Disallow: /en/index.php
Disallow: /en/index.php/


## /sv
# CSS, JS, Images
Allow: /sv/core/*.css$
Allow: /sv/core/*.css?
Allow: /sv/core/*.js$
Allow: /sv/core/*.js?
Allow: /sv/core/*.gif
Allow: /sv/core/*.jpg
Allow: /sv/core/*.jpeg
Allow: /sv/core/*.png
Allow: /sv/core/*.svg
Allow: /sv/profiles/*.css$
Allow: /sv/profiles/*.css?
Allow: /sv/profiles/*.js$
Allow: /sv/profiles/*.js?
Allow: /sv/profiles/*.gif
Allow: /sv/profiles/*.jpg
Allow: /sv/profiles/*.jpeg
Allow: /sv/profiles/*.png
Allow: /sv/profiles/*.svg
# Directories
Disallow: /sv/core/
Disallow: /sv/profiles/
# Files
Disallow: /sv/README.md
Disallow: /sv/composer/Metapackage/README.txt
Disallow: /sv/composer/Plugin/ProjectMessage/README.md
Disallow: /sv/composer/Plugin/Scaffold/README.md
Disallow: /sv/composer/Plugin/VendorHardening/README.txt
Disallow: /sv/composer/Template/README.txt
Disallow: /sv/modules/README.txt
Disallow: /sv/sites/README.txt
Disallow: /sv/themes/README.txt
Disallow: /sv/web.config
# Paths (clean URLs)
Disallow: /sv/admin/
Disallow: /sv/comment/reply/
Disallow: /sv/filter/tips
Disallow: /sv/node/add/
Disallow: /sv/search/
Disallow: /sv/user/register
Disallow: /sv/user/password
Disallow: /sv/user/login
Disallow: /sv/user/logout
# Paths (no clean URLs)
Disallow: /sv/index.php/admin/
Disallow: /sv/index.php/comment/reply/
Disallow: /sv/index.php/filter/tips
Disallow: /sv/index.php/node/add/
Disallow: /sv/index.php/search/
Disallow: /sv/index.php/user/password
Disallow: /sv/index.php/user/register
Disallow: /sv/index.php/user/login
Disallow: /sv/index.php/user/logout
# Search
Disallow: /sv/search/
Disallow: /sv/lubas/courses-programmes/
Disallow: /sv/lubas/programs/
Disallow: /sv/studera/kurser-program/
Disallow: /sv/study/courses-programmes/
# Disallow all on index.php
Disallow: /sv/index.php
Disallow: /sv/index.php/


## /internal
# CSS, JS, Images
Allow: /internal/core/*.css$
Allow: /internal/core/*.css?
Allow: /internal/core/*.js$
Allow: /internal/core/*.js?
Allow: /internal/core/*.gif
Allow: /internal/core/*.jpg
Allow: /internal/core/*.jpeg
Allow: /internal/core/*.png
Allow: /internal/core/*.svg
Allow: /internal/profiles/*.css$
Allow: /internal/profiles/*.css?
Allow: /internal/profiles/*.js$
Allow: /internal/profiles/*.js?
Allow: /internal/profiles/*.gif
Allow: /internal/profiles/*.jpg
Allow: /internal/profiles/*.jpeg
Allow: /internal/profiles/*.png
Allow: /internal/profiles/*.svg
# Directories
Disallow: /internal/core/
Disallow: /internal/profiles/
# Files
Disallow: /internal/README.md
Disallow: /internal/composer/Metapackage/README.txt
Disallow: /internal/composer/Plugin/ProjectMessage/README.md
Disallow: /internal/composer/Plugin/Scaffold/README.md
Disallow: /internal/composer/Plugin/VendorHardening/README.txt
Disallow: /internal/composer/Template/README.txt
Disallow: /internal/modules/README.txt
Disallow: /internal/sites/README.txt
Disallow: /internal/themes/README.txt
Disallow: /internal/web.config
# Paths (clean URLs)
Disallow: /internal/admin/
Disallow: /internal/comment/reply/
Disallow: /internal/filter/tips
Disallow: /internal/node/add/
Disallow: /internal/search/
Disallow: /internal/user/register
Disallow: /internal/user/password
Disallow: /internal/user/login
Disallow: /internal/user/logout
# Paths (no clean URLs)
Disallow: /internal/index.php/admin/
Disallow: /internal/index.php/comment/reply/
Disallow: /internal/index.php/filter/tips
Disallow: /internal/index.php/node/add/
Disallow: /internal/index.php/search/
Disallow: /internal/index.php/user/password
Disallow: /internal/index.php/user/register
Disallow: /internal/index.php/user/login
Disallow: /internal/index.php/user/logout
# Search
Disallow: /internal/search/
Disallow: /internal/lubas/courses-programmes/
Disallow: /internal/lubas/programs/
Disallow: /internal/studera/kurser-program/
Disallow: /internal/study/courses-programmes/
# Disallow all on index.php
Disallow: /internal/index.php
Disallow: /internal/index.php/


## /internt
# CSS, JS, Images
Allow: /internt/core/*.css$
Allow: /internt/core/*.css?
Allow: /internt/core/*.js$
Allow: /internt/core/*.js?
Allow: /internt/core/*.gif
Allow: /internt/core/*.jpg
Allow: /internt/core/*.jpeg
Allow: /internt/core/*.png
Allow: /internt/core/*.svg
Allow: /internt/profiles/*.css$
Allow: /internt/profiles/*.css?
Allow: /internt/profiles/*.js$
Allow: /internt/profiles/*.js?
Allow: /internt/profiles/*.gif
Allow: /internt/profiles/*.jpg
Allow: /internt/profiles/*.jpeg
Allow: /internt/profiles/*.png
Allow: /internt/profiles/*.svg
# Directories
Disallow: /internt/core/
Disallow: /internt/profiles/
# Files
Disallow: /internt/README.md
Disallow: /internt/composer/Metapackage/README.txt
Disallow: /internt/composer/Plugin/ProjectMessage/README.md
Disallow: /internt/composer/Plugin/Scaffold/README.md
Disallow: /internt/composer/Plugin/VendorHardening/README.txt
Disallow: /internt/composer/Template/README.txt
Disallow: /internt/modules/README.txt
Disallow: /internt/sites/README.txt
Disallow: /internt/themes/README.txt
Disallow: /internt/web.config
# Paths (clean URLs)
Disallow: /internt/admin/
Disallow: /internt/comment/reply/
Disallow: /internt/filter/tips
Disallow: /internt/node/add/
Disallow: /internt/search/
Disallow: /internt/user/register
Disallow: /internt/user/password
Disallow: /internt/user/login
Disallow: /internt/user/logout
# Paths (no clean URLs)
Disallow: /internt/index.php/admin/
Disallow: /internt/index.php/comment/reply/
Disallow: /internt/index.php/filter/tips
Disallow: /internt/index.php/node/add/
Disallow: /internt/index.php/search/
Disallow: /internt/index.php/user/password
Disallow: /internt/index.php/user/register
Disallow: /internt/index.php/user/login
Disallow: /internt/index.php/user/logout
# Search
Disallow: /internt/search/
Disallow: /internt/lubas/courses-programmes/
Disallow: /internt/lubas/programs/
Disallow: /internt/studera/kurser-program/
Disallow: /internt/study/courses-programmes/
# Disallow all on index.php
Disallow: /internt/index.php
Disallow: /internt/index.php/


## /en/internal
# CSS, JS, Images
Allow: /en/internal/core/*.css$
Allow: /en/internal/core/*.css?
Allow: /en/internal/core/*.js$
Allow: /en/internal/core/*.js?
Allow: /en/internal/core/*.gif
Allow: /en/internal/core/*.jpg
Allow: /en/internal/core/*.jpeg
Allo
sitemap.xml 200 OK
Type Sitemap Index URLs 2 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
lu.se — via Loopia AB, 41 years, 10 months old
PASS
lu.se — via Loopia AB, 41 years, 10 months old
Info::
Domain registered until Dec 31, 2026 (8 months remaining)
Info::
Registrar: Loopia AB
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

166 days

December 31, 2026

SSL certificate

57 days

Issued by Let's Encrypt

Domain age

41 years, 10 months

Registered January 17, 1985

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

ASN AS2846

130.235.138.12

Registrar

Loopia AB

Unlocked 3 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 Loopia AB
Created January 17, 1985 (41 years, 10 months ago)
Expires December 31, 2026 (8 months)
Last Updated December 2, 2025
Name Servers nsa.lu.se, sunic.sunet.se, nsc.lu.se
Registrant gunlun4049-00001
Hosting
IP Address 130.235.138.12
ASN AS2846 ()
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+
CDN & Delivery
Varnish (HIT)
PASS
Varnish (HIT)
Info::
Site is served via Varnish CDN
Got: via: 1.1 varnish (Varnish/6.0)
Info::
CDN cache status: HIT
CDN Detected: Varnish
Provider Varnish Cache Status HIT Evidence via: 1.1 varnish (Varnish/6.0)
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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