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SGSiteGraph

sdn.cz

Last scanned Jul 24, 2026, 6:27 PM

71

Overall score

Fair

Summary

This website uses Nginx hosted on SEZNAM-CZ - SEZNAM-CZ, CZ. SEO is poor (40/100) and accessibility is good (75/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing <title>.

CZ
Hosted on SEZNAM-CZ - SEZNAM-CZ, CZ

Top issues to fix

12 issues found · 5 high priority

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing title tag

    SEO

    Add a unique, descriptive <title> tag — it's the single most important on-page SEO element.

  • Missing meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • 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 viewport meta tag

    Accessibility

    Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

+6 more issues — details in the sections below.

40

SEO

7 issue(s) found

100

Performance

127 ms

75

Security

HTTPS & header checks

75

Accessibility

3 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Meta tags

Title
Description
Canonical
Language
Charset
Viewport
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

CDN provider
—
IP address
77.75.79.195
ASN
AS43037 (SEZNAM-CZ - SEZNAM-CZ, CZ)

DNS records

TypeValue
A
  • 77.75.79.195
  • 77.75.77.195
AAAA
  • 2a02:598:a::79:195
  • 2a02:598:2::1195
MX—
TXT
  • google-site-verification=xRa-9L9fTtJYHITIHBwoOu6PzbUIBpsKqOMh3fLpvZU
  • google-site-verification=H9hnIkJHfWF07LHKFKBwlbsrBVrtLoa0YmF4KnCaGL8
NS
  • ams.seznam.cz
  • ans.seznam.cz
CAA
  • 0 issue "letsencrypt.org"
  • 0 iodef "mailto:abuse-caa@firma.seznam.cz"
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
*.sdn.cz
Valid from
Jul 7, 2026
Valid to
Oct 5, 2026
Days until expiry
72
SAN domains
*.sdn.cz, *.sdn.szn.cz, sdn.cz, sdn.szn.cz

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

0 internal · 0 external · 0 broken

Images

0 total · 0 missing alt

Scripts / Styles

0 scripts · 0 stylesheets

JS / CSS size

0 B · 0 B

Page size

2 B

Robots.txt & Sitemap

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

SEO issues

  • Missing <title>
  • Missing meta description
  • Missing canonical link
  • No H1 heading found
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found
  • Missing <html lang> attribute
  • Missing viewport meta tag

Scan details

Requested URL
https://sdn.cz
Final URL
https://sdn.cz
HTTP status
200
HTTP version
HTTP/2
Response time
127 ms
HTML size
2 B
Redirect chain
https://sdn.cz

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does sdn.cz use?
sdn.cz is built with Nginx.
Is sdn.cz secure (HTTPS)?
Yes. sdn.cz uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 5, 2026.
Who hosts sdn.cz?
sdn.cz is hosted on SEZNAM-CZ - SEZNAM-CZ, CZ.
What is sdn.cz's SEO score?
sdn.cz scored 40/100 for SEO in the latest analysis (poor).
What is sdn.cz's overall website score?
sdn.cz has an overall SiteGraph score of 71/100, combining SEO, performance, security, and accessibility.