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https://liu.se

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
99
GRADE
A+
FIX
1
REVIEW
1
PASS
7
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
7 PASS 1 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
TLS Certificate Expiry & Recommendations
53 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

53
days left
0d 30d 60d 90d+

Recommended actions

  • Add includeSubDomains to the HSTS directive
  • 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, 139 ms lookup
PASS
1 A records, 139 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 130.236.18.52
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: 2001:6b0:17:f100::18:52
Info::
3 nameserver(s) configured
Got: ns3.liu.se, ns4.liu.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: 139 ms
Got: 139 ms
A130.236.18.52
AAAA2001:6b0:17:f100::18:52
CNAME—
NSns3.liu.se, ns4.liu.se, sunic.sunet.se
MX
20 liu-se.mail.protection.outlook.com
TXT
onetrust-domain-verification=6395e087f71047acbfed803444d7225c
Wj9GiC5Odz69gYhwyRfmweCsYW09jv3XC8WopVAdvMFF/lyoYPJnLKHnwXYRKf9Hxhh197Tri7V3Xxsa...
canva-site-verification=G1DsDdUTb-poz0XM3Jb_EQ
SPF v=spf1 +ip4:130.236.0.0/16 +ip6:2001:6b0:17::/48 include:spf.protection.outlook....
ZOOM_verify__IVTfY8nSHOL-qRMRLRBEg
MS=ms22226716
adobe-idp-site-verification=c5cff5372afafaee2faa9836950eb48bffb02fec9b5af3fab9bc...
autodesk-domain-verification=ve1q8LiBOwQ-7cjPTV0Y
MS=ms85100167
google-site-verification=BqNguxZguI-ROsTDOffJYIbpp3xG-AnGw1UuB9bLz_8
TeXoJcGilMACE4ZaaVK68AEKhdEDMrLv
google-site-verification=3KQVNJpqJy1SccT-B4gOno8UGDneIdJA1EUfercg7l0
CAALookup not available with standard resolver
Resolved in 139 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://liu.se

https://liu.se

185 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://liu.se200185 msHTTP/1.1Apache
A+
IPv6 Readiness
IPv6 reachable (51 ms)
PASS
IPv6 reachable (51 ms)
Info::
IPv6 is configured and reachable at 2001:6b0:17:f100::18:52
Got: 51 ms connect
IPv6 Ready
AAAA Records 2001:6b0:17:f100::18:52 Connection Reachable (51 ms)
A+
Crawlability
robots.txt present, sitemap with 1 URLs
PASS
robots.txt present, sitemap with 1 URLs
Info::
robots.txt is present
Got: 174 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1 entries
Info::
Sitemap index with 1 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 174 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
# Robots.txt for https://liu.se/

User-agent: *

Disallow: /temp/
Disallow: /temporary/
Disallow: /test/
Disallow: /sok
Disallow: /en/search

Sitemap: https://liu.se/sitemap
sitemap.xml 200 OK
Type Sitemap Index URLs 1 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

302https://www.liu.se/
200https://liu.se/

Preferred variant: non-www

HTTP → HTTPS

301http://liu.se/ → https://liu.se/

Consistent

A+
Domain Intelligence
liu.se — via NMU Group, 39 years, 8 months old
PASS
liu.se — via NMU Group, 39 years, 8 months old
Info::
Domain registered until Dec 31, 2026 (8 months remaining)
Info::
Registrar: NMU Group
Info::
Registrar lock is enabled
Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.
Domain expiry

165 days

December 31, 2026

SSL certificate

53 days

Issued by Let's Encrypt

Domain age

39 years, 8 months

Registered February 25, 1987

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

2001:6b0:17:f100::18:52

Registrar

NMU Group

Locked 3 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar NMU Group
Created February 25, 1987 (39 years, 8 months ago)
Expires December 31, 2026 (8 months)
Last Updated December 31, 2025
Name Servers sunic.sunet.se, ns3.liu.se, ns4.liu.se
Registrant GSJxoCy6oa3wJhv2
Hosting
IP Address 2001:6b0:17:f100::18:52
Data source: whois (0.5s)

Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.

Why this matters

Registrar lock (clientTransferProhibited et al.) prevents unauthorized domain transfers — strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A
HTTP Probe Timing
Total 510 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
59 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
51 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
67 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
511 ms
Total Time Total request time from DNS lookup through full response.
511 ms

Connection waterfall

DNS Lookup 59 ms TCP Connect 51 ms TLS Handshake 67 ms Server Processing 334 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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