Website readiness profile · Snapshot 23 October 2026
t-online.de
t-online.de's public homepage, certificate and DNS checked against 31 practices and compared with 3,856 News & Media sites.
- Readiness index
- 77/100
- Ahead of
- 82%
- Practices observed
- 23/31
- Popularity band
- Top 1K
News & Media median 68
of measured News & Media sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: t-online.de. Thin bar: News & Media peer median.
Enable
79/100
Peers 89
Harden
69/100
Peers 56
Accelerate
85/100
Peers 68
Recover
100/100
Peers 11
Priority fixes for t-online.de
Ordered by impact and by how common each practice is among peers.
Priority 1 · Enable
XML sitemap discoverable
Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.
Why it matters: A sitemap helps search engines find new and updated pages, especially on large or frequently updated sites.
What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.
87% of News & Media peers do this. Limit: Only the standard location was requested, once, at the time of the check.
Guide: XML Sitemap Guide: Include Only URLs You Stand Behind
Priority 2 · Accelerate
Static files cached for 30 days or more
Observed: A same-site stylesheet or script was cacheable for 1 hours, short of the 30-day benchmark.
What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
60% of News & Media peers do this.
Priority 3 · Harden
DMARC policy enforces quarantine or reject
Observed: The DMARC policy for t-online.de was p=none, which asks receivers to take no action on failing mail.
What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.
37% of News & Media peers do this.
Priority 4 · Enable
Social preview image set
Observed: The homepage had no og:image, so shared links may show without a preview image.
What to do: Add Open Graph tags, including og:image with a 1200 x 630 image.
71% of News & Media peers do this.
What t-online.de already does well
Practices fewer than half of News & Media peers use.
- Nameservers spread across providersNameservers spread across more than one operator.11% of peers
- Referrer-Policy setReferrer-Policy present.22% of peers
- Content Security Policy presentContent-Security-Policy present.29% of peers
What we saw
- Homepage checked
- https://www.t-online.de/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Amazon, 197-day validity, expiring 2027-03-26
- CDN or edge
- Amazon CloudFront
- Platform or framework
- Next.js
- DNS operators
- 2 self-run or other nameserver domains
- HSTS
- max-age 365 days, includeSubDomains, preload
- DMARC policy
- p=none
- Homepage HTML
- 1,429 KB, br
- Images on homepage
- 317 (jpg 549, svg 184, png 125, webp 13)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 8
Observed 23
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- Modern image formats in use
- Offscreen images lazy-loaded
- No render-blocking scripts in <head>
- robots.txt published
- Reachable over IPv6
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Page language declared
- At most one redirect to the homepage
- Nameservers spread across providers
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Live status for this site: Status Is Down: t-online.de. This profile covers configuration only.