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.
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, no sitemapREVIEW
A sitemap helps search engines discover and index your pages more efficiently.
No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.
Learn more ▾ ▴
A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.
Source: sitemaps.org / Google Search Central
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
User-agent: *
Disallow: /native/
Disallow: /auth/
Disallow: /?artid
Disallow: /preisvergleich/
Disallow: /spiele/weihnachtsspiele/
Disallow: /studiopreview_
Disallow: /vid_1/
Disallow: /,ei=
Disallow: /,linkId=
Disallow: /,pt=pictureEnlarge
Disallow: /,pt=print
Disallow: /,pt=self
Disallow: /,tid=print
Disallow: /,vv=P5
Disallow: /,vv=enlarge
Disallow: */tid_external_content_proxy/
Disallow: /-/id_62530634/tid_tsr_iframe_loginbox/index
Disallow: /-/id_62530634/tid_tsr_iframe_loginbox_buzz/index
Disallow: /gtm.js
Disallow: /metatag/
Disallow: /ki-ratgeber/
Disallow: /api/greenplayer/
User-agent: GPTBot
Disallow: /
Allow: /finanzen/versichern-und-vorsorgen/
User-agent: PerplexityBot
Disallow: /
Allow: /finanzen/versichern-und-vorsorgen/
User-agent: ClaudeBot
Disallow: /
Allow: /finanzen/versichern-und-vorsorgen/
User-agent: Applebot-Extended
User-agent: Bytespider
User-agent: CCBot
User-agent: Google-Extended
User-agent: Meta-ExternalAgent
User-agent: meta-externalagent
Disallow: /
Allow: /finanzen/versichern-und-vorsorgen/
# Legal notice: t-online.de expressly reserves the right to use its content for commercial text and data mining (§ 44 b UrhG).
# The use of robots or other automated means to access t-online.de or collect or mine data without
# the express permission of t-online.de is strictly prohibited.
# t-online.de may, in its discretion, permit certain automated access to certain t-online.de pages,
# If you would like to apply for permission to crawl t-online.de, collect or use data, please email t-online@stroeer.de
No sitemap found
Adding a sitemap helps search engines discover your pages.
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations67 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- 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 Records3 A records, 49 ms lookupPASS
| A | 54.217.253.146, 34.246.241.220, 52.209.116.123 |
| AAAA | — |
| CNAME | — |
| NS | dns00.dns.t-ipnet.de, pns.dtag.de, dns50.dns.t-ipnet.de, dns02.dns.t-ipnet.de, dns20.dns.t-ipnet.de |
| MX | 10 mx00.t-online.de 10 mx02.t-online.de 10 mx01.t-online.de 10 mx03.t-online.de |
| TXT | google-site-verification=kLomR9c2yDgU-AUYNr9ma0XbvmzaOR_ZCv_ppOvbB6Y google-site-verification=RuaGdsiIYwzDsAd0_s7yhFgYuYRc0Ylk01j209Mgvis google-site-verification=cKQjq9M78jbRX073a91_V3oBM76hqbQDnK2uGelDpto google-site-verification=pOdK8ndAYqDGA8-03SAwZoeJvnSWE50S25j_63u0FWw google-site-verification=dNVp8NLTkRfU1YikWSzxglE25kMfUtFNyoiIxcnxiRc google-site-verification=Zl48ijjwoVxIifNuZ5ozcydysO5owxNB1Z4V--dkgE0 SPF v=spf1 ip4:194.25.134.16/28 ip4:194.25.134.80/28 ~all google-site-verification=kOtokoaNZwnXoLMiWNnaX3leVCyA9DaOlP1IJKYu1DI BSI103622123645 google-site-verification=YCYBJAGc1hE2hjEuhkLfNgzbAc1WWOi5AKyoCDlrhcE google-site-verification=s1qp7xSUgoBjWm5tTL7j8c-opGfm7YdlIBkutNbS_kA |
| CAA | Lookup not available with standard resolver |
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), 223 ms totalPASS
https://t-online.de
107 ms · HTTP/1.1
https://www.t-online.de/
116 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://t-online.de | 301 | 107 ms | HTTP/1.1 | |
| 2 | https://www.t-online.de/ | 200 | 116 ms | HTTP/1.1 | envoy |
See the visual redirect chain in the HTTP Probe tab →
A+Domain Intelligencet-online.de — hosted on AWSPASS
Unknown
67 days
Issued by Let's Encrypt
Unknown
Status unknown
Protects against DNS spoofing
AWS
ASN AS16509
34.246.241.220
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