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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
83
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
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

C
URL Variants
Action
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
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.gu.se/
200https://gu.se/

Inconsistent — duplicate content risk

HTTP → HTTPS

302http://gu.se/ → https://gu.se/

Use 301 (permanent) instead of 302 (temporary)

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

Certificate validity

87
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, 245 ms lookup
PASS
1 A records, 245 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 130.241.39.203
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: ns2.net.gu.se, sunic.sunet.se, ns2.chalmers.se, ns1.net.gu.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
Warning::
DNS resolution is slow (245 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 245 ms
A130.241.39.203
AAAA—
CNAME—
NSns2.net.gu.se, sunic.sunet.se, ns2.chalmers.se, ns1.net.gu.se
MX
10 gu-se.mail.protection.outlook.com
TXT
mandrill_verify.oCFTiTf4NIqZmUDkSDW1vA
HARICA-LO8cC2JGZhFEThSBpeG
HARICA-jBlxZ3v25ZVvol58IVw
atlassian-domain-verification=6Z6mb/CK6tL0szYjaJhRwpuBMgurE2vRjNw7AHfrowHpyFCT6a...
SPF v=spf1 ip4:130.235.56.200 ip4:79.136.98.172 ip4:91.123.56.128 ip4:193.26.30.0/25...
lime-domain-verification=2EFB0D28674E1A3
openai-domain-verification=dv-WdBUPW7PT8qX1Ws9jG5XZee0
projectdiscovery-verification=23294731ed
facebook-domain-verification=y5y71rnwe34fx1x2rj5w9jjdin0me8
M6qB2nDaE4odoBIVY6t2HSH3d5wyAPyQsgmW5pd1/Lc4z4KhJuTJ42x3AzZ1nmomSwAS/S9LAkHZ5r1B...
facebook-domain-verification=nmt239dvy5mjzpu24ngkelqe9ww6r4
miro-verification=d5a6a5db9288449281bc36da55d0a056ba08bdb2
adobe-idp-site-verification=c2a0682bad454fc9abdaac816101ff94104948d70179e0bba9cc...
apple-domain-verification=ocfEtR2ZhZkwBWeK
google-site-verification=d51zezRWehjY_tfUfKR25u-IJsh9ri5QiK88i73cpBw
MS=ms77028744
mandrill_verify._CuH-xX7ZMOZE2ysN8mEjg
mentimeter-5a7c3cdb-74b0-43f5-bad0-f7bc1cd02a8f
CAALookup not available with standard resolver
Resolved in 245 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
Redirect Chain
1 redirect(s), 364 ms total
PASS
1 redirect(s), 364 ms total
Info::
Single redirect
Got: https://gu.se → https://www.gu.se/ (301)
Info::
WWW normalization redirect

https://gu.se

158 ms · HTTP/1.1

301

https://www.gu.se/

206 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://gu.se301158 msHTTP/1.1
2https://www.gu.se/200206 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 29 URLs
PASS
robots.txt present, sitemap with 29 URLs
Info::
robots.txt is present
Got: 2045 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 29 entries
Info::
Sitemap index with 29 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2045 B Sitemaps referenced 1 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
# 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

Sitemap: https://www.gu.se/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 29 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
gu.se — via Loopia AB, 37 years, 10 months old
PASS
gu.se — via Loopia AB, 37 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

198 days

December 31, 2026

SSL certificate

87 days

Issued by Let's Encrypt

Domain age

37 years, 10 months

Registered January 1, 1989

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

Unknown

ASN AS2842

130.241.39.203

Registrar

Loopia AB

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 Loopia AB
Created January 1, 1989 (37 years, 10 months ago)
Expires December 31, 2026 (8 months)
Last Updated February 13, 2019
Name Servers ns1.net.gu.se, ns2.chalmers.se, ns2.net.gu.se, sunic.sunet.se
Registrant stegte1761-00001
Hosting
IP Address 130.241.39.203
ASN AS2842 ()
Data source: whois (0.9s)

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

Connection waterfall

DNS Lookup 99 ms TCP Connect 46 ms TLS Handshake 55 ms Server Processing 58 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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