3sat.de
Startseite - 3sat-Mediathek
Last scanned Jul 26, 2026, 5:17 AM · 2 views
Overall score
Great
Summary
Videos und Livestreams in der 3satMediathek anschauen! Entdecken Sie Dokumentationen, Magazine aus Kultur, Wissenschaft, Gesellschaft und vieles mehr!. This website is hosted on AKAMAI-AS - Akamai Technologies, Inc., US. SEO is excellent (90/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: No H1 heading found.
3sat
Videos und Livestreams in der 3satMediathek anschauen! Entdecken Sie Dokumentationen, Magazine aus Kultur, Wissenschaft, Gesellschaft und vieles mehr!
- ZDF-Straße 1, Mainz, Deutschland, 55127
- Hosted on AKAMAI-AS - Akamai Technologies, Inc., US
Top issues to fix
5 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
SEO
1 issue(s) found
Performance
672 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
3sat
Videos und Livestreams in der 3satMediathek anschauen! Entdecken Sie Dokumentationen, Magazine aus Kultur, Wissenschaft, Gesellschaft und vieles mehr!
Contact
Email, phone, and address published on this site's own pages.
- info@zdf.de
- Address
- ZDF-Straße 1, Mainz, Deutschland, 55127
Meta tags
- Title
- Startseite - 3sat-Mediathek
- Description
- Videos und Livestreams in der 3satMediathek anschauen! Entdecken Sie Dokumentationen, Magazine aus Kultur, Wissenschaft, Gesellschaft und vieles mehr!
- Canonical
- https://www.3sat.de/
- Language
- de
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://www.3sat.de/static/0.114.181/img/appicons/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
No technologies detected.
Hosting & CDN
- Hosting provider
- AKAMAI-AS - Akamai Technologies, Inc., US
- CDN provider
- —
- IP address
- 104.81.127.2
- ASN
- AS16625 (AKAMAI-AS - Akamai Technologies, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME |
|
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- DigiCert Inc
- Subject
- www.zdf.de
- Valid from
- Jul 24, 2026
- Valid to
- Feb 7, 2027
- Days until expiry
- 196
- SAN domains
- www.zdf.de, *.3sat.de, *.heute.de, *.logo.de, *.phoenix.de, *.sc.zdf.de, *.tivi.de, *.zdf.de, *.zdfheute.de, *.zdfinfo.de, *.zdfkultur.de, *.zdfneo.de, *.zdfsport.de, clip-i.ngs.zdf.de, clip-p.ngs.zdf.de, fernsehrat.de, livebackup-i-stg.ngs.zdf.de, livebackup-i.ngs.zdf.de, livebackup-s.ngs.zdf.de, livemain-i-stg.ngs.zdf.de, livemain-i.ngs.zdf.de, livemain-s.ngs.zdf.de, vod-i-stg.ngs.zdf.de, vod-i.ngs.zdf.de, vod-s.ngs.zdf.de, www.fernsehrat.de, www.heute-show.de, www.heute-show.zdf.de, www.heuteshow.de, www.heuteshow.zdf.de, zdf.de
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 33 · H3 16
Links
41 internal · 11 external · 0 broken
Images
12 total · 0 missing alt
Scripts / Styles
8 scripts · 1 stylesheets
JS / CSS size
8.9 KB · 12.3 KB
Page size
522 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- No H1 heading found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://3sat.de
- Final URL
- https://www.3sat.de/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 662 ms
- HTML size
- 522 KB
- Redirect chain
- https://3sat.de → https://www.3sat.de/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does 3sat.de use?
- We did not detect any specific technologies for 3sat.de in the latest scan.
- Is 3sat.de secure (HTTPS)?
- Yes. 3sat.de uses TLS 1.3 with a certificate issued by DigiCert Inc, valid until Feb 7, 2027.
- Who hosts 3sat.de?
- 3sat.de is hosted on AKAMAI-AS - Akamai Technologies, Inc., US.
- What is 3sat.de's SEO score?
- 3sat.de scored 90/100 for SEO in the latest analysis (excellent).
- What is 3sat.de's overall website score?
- 3sat.de has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.
- What company operates 3sat.de?
- 3sat.de is operated by 3sat. Videos und Livestreams in der 3satMediathek anschauen! Entdecken Sie Dokumentationen, Magazine aus Kultur, Wissenschaft, Gesellschaft und vieles mehr!
OpenGraph & Twitter Card
OpenGraph
Twitter Card