Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DRedirect ChainAction2 redirect(s), 1779 ms totalFIX
https://mpg.de
113 ms · HTTP/1.0
https://www.mpg.de/
759 ms · HTTP/1.1
https://www.mpg.de/de
908 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://mpg.de | 301 | 113 ms | HTTP/1.0 | BigIP |
| 2 | https://www.mpg.de/ | 301 | 759 ms | HTTP/1.1 | Apache |
| 3 | https://www.mpg.de/de | 200 | 908 ms | HTTP/1.1 | Apache |
See the visual redirect chain in the HTTP Probe tab →
Each redirect adds latency. Try to minimize the chain to 1 hop.
Redirect chain — each hop adds latency; combine into one redirect where possible.
Source: Google Search Central / web.dev
DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BCrawlabilityrobots.txt present, sitemap with 0 URLsREVIEW
Search engines may not be able to parse the sitemap. Fix XML validation errors.
An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.
Learn more ▾ ▴
Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.
Source: sitemaps.org / Google Search Central
An empty sitemap provides no value. Add <url> entries for your pages.
An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.
Learn more ▾ ▴
Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.
Source: Google Search Central / sitemaps.org
# Generated by CMS-App (default)
User-agent: *
Sitemap: https://www.mpg.de/sitemap.xml
BTLS Certificate Expiry & Recommendations199 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
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 Records1 A records, 44 ms lookupPASS
| A | 134.76.31.198 |
| AAAA | — |
| CNAME | — |
| NS | ns1.es.net, dns2.gwdg.de, dns1.gwdg.de, sat.mpcdf.mpg.de, dns3.gwdg.de |
| MX | 50 b1236.mx.srv.dfn.de 50 a1236.mx.srv.dfn.de 50 c1236.mx.srv.dfn.de |
| TXT | google-site-verification=XHSgSiW3S-oNc6utmVvWr_K-iNo1ZpYHGDMV1ev8txw adobe-idp-site-verification=4efc5f4912ea5b60334e2704bb3eb956c5e7849e481abd33757f... hibp-verify=dweb_0tywy72sz0avnp2yfrm5v1g9 zone-ownership-verification-4e95ba1562fe6b7d7fd5000d249ed3fefed9803b10aab281fb17... SPF v=spf1 mx include:spf.gwdg.de include:spf.yve-tool.de ip4:155.56.221.13 ip4:155.... google-site-verification=dnSBuenbktdrWBa2AyYCTsb6kohTtitwQvtLHzFcXWM MS=ms65105063 google-site-verification=_8HT2hqpeJwL__q-eYwM6eKubRP2nX8kFao2_IlfZOc |
| 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.
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencempg.de — hosted on GOENET, DEPASS
Unknown
199 days
Issued by Hellenic Academic and Research Institutions CA
Unknown
Status unknown
Protects against DNS spoofing
GOENET, DE
ASN AS207592
134.76.31.198
Registrar unknown
Expiry timeline
Recommended actions
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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