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.

Hosting provider information for 3sat.de is not available yet.

What is 3sat.de's SEO score?

3sat.de scored 80/100 for SEO in the latest analysis (great).

What is 3sat.de's overall website score?

3sat.de has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.

Has 3sat.de's score changed over time?

3sat.de's overall score has declined by 3 points (from 84 to 81) since Jul 26, 2026.

3sat.de

Startseite - 3sat-Mediathek

Last scanned Aug 2, 2026, 8:00 AM · 11 views

Overall score

Great

Summary

Videos und Livestreams in der 3satMediathek anschauen! Entdecken Sie Dokumentationen, Magazine aus Kultur, Wissenschaft, Gesellschaft und vieles mehr!. SEO is good (80/100) 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

Top issues to fix

8 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEO
Add 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
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

SEO

3 issue(s) found

Performance

279 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Score history

-3 overall since Jul 26, 2026

Overall: 81
SEO: 80
Security: 65
Performance: 90
Accessibility: 90

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!

Facebook X (Twitter)Instagram

Contact

Email, phone, and address published on this site's own pages.

Email: 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: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

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: 189
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 13

Links

41 internal · 11 external · 20 broken

Images

12 total · 0 missing alt

Scripts / Styles

4 scripts · 1 stylesheets

JS / CSS size

8.9 KB · 1.6 KB

Page size

523 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

No H1 heading found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://3sat.de
Final URL: https://www.3sat.de/
HTTP status: 200
HTTP version: HTTP/2
Response time: 269 ms
HTML size: 523 KB
Redirect chain: https://3sat.de → https://www.3sat.de/

See something wrong on this report? Request a correction

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?: Hosting provider information for 3sat.de is not available yet.
What is 3sat.de's SEO score?: 3sat.de scored 80/100 for SEO in the latest analysis (great).
What is 3sat.de's overall website score?: 3sat.de has an overall SiteGraph score of 81/100, 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!
Has 3sat.de's score changed over time?: 3sat.de's overall score has declined by 3 points (from 84 to 81) since Jul 26, 2026.