Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CURL VariantsActionwww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Use 301 (permanent) instead of 302 (temporary)
BTLS Certificate Expiry & Recommendations223 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
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 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 Records1 A records, 31 ms lookupPASS
| A | 129.125.2.51 |
| AAAA | 2001:610:1a08:292:129:125:2:51 |
| CNAME | — |
| NS | dns3.rug.nl, dns2.rug.nl, ns2.surfnet.nl, dns1.rug.nl, ns1.surfnet.nl |
| MX | 10 ASPMX.L.GOOGLE.COM 20 ALT1.ASPMX.L.GOOGLE.COM 20 ALT2.ASPMX.L.GOOGLE.COM 30 ASPMX3.GOOGLEMAIL.COM 30 ASPMX2.GOOGLEMAIL.COM |
| TXT | HARICA-iXUSYZelD4KghRtTA8V University of Groningen google-site-verification=LzOS5q7nSbDRZFZ0FMFKbWSvsfDE8bL861TAh-czT7k MS=ms97484282 mistral-domain-verification=139d17efc022c67581effa2fc6e0bb747d0c9456 SPF v=spf1 include:spf1.rug.nl include:spf2.rug.nl include:spf3.rug.nl include:spf4.... bw=7iePWW2zaVtqaRhZZjRWUu985gQ1Ia26nUAJ3BDXMYBp google-site-verification=pMjlXqlOTWrDjxV9AoW_MGyuGOV3lEAsQ7__vv525Ag |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
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.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
ARedirect Chain1 redirect(s), 309 ms totalPASS
https://rug.nl
109 ms · HTTP/1.0
https://www.rug.nl/
200 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://rug.nl | 301 | 109 ms | HTTP/1.0 | BigIP |
| 2 | https://www.rug.nl/ | 200 | 200 ms | HTTP/1.1 |
See the visual redirect chain in the HTTP Probe tab →
A+IPv6 ReadinessIPv6 reachable (34 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 2 URLsPASS
User-agent: MagnetmeBot
Disallow: /
User-agent: *
Disallow: /sciencelinx/blackholegame/index.html/robots.txt
Disallow: /_shared/
Disallow: /webvernieuwing/
Disallow: /forms/
Disallow: /*browseandselect
Disallow: /*browseAndSelect
Disallow: /*!find
Disallow: /*!mailTo
Disallow: /*!languagepreference
Disallow: /*!content
Disallow: /*!getAnalytics
Disallow: /*!rss
Disallow: /*!sso
Disallow: /*/old-research
Disallow: /society-business/centre-for-information-technology/organisation/pictogram/archief/
Disallow: /*?*pageSize=
Disallow: /*?*ordering=
Disallow: /*?*nofollow=true
Disallow: /*/concepts/
Disallow: /*.rss
Disallow: /*.xps
Disallow: /*hfid=
Sitemap: https://www.rug.nl/sitemaps/publicSitemapIndex.xml
A+Domain Intelligencerug.nl — via Rijksuniversiteit Groningen, 38 years, 5 months oldPASS
Unknown
223 days
Issued by Hellenic Academic and Research Institutions CA
38 years, 5 months
Registered June 2, 1988
Not enabled
Protects against DNS spoofing
Unknown
2001:610:1a08:292:129:125:2:51
Rijksuniversiteit Groningen
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
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.
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