What technology does 257.cz use?

257.cz is built with jQuery, Nginx.

Is 257.cz secure (HTTPS)?

Yes. 257.cz uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 24, 2026.

Hosting provider information for 257.cz is not available yet.

What is 257.cz's SEO score?

257.cz scored 65/100 for SEO in the latest analysis (fair).

What is 257.cz's overall website score?

257.cz has an overall SiteGraph score of 75/100, combining SEO, performance, security, and accessibility.

Has 257.cz's score changed over time?

257.cz's overall score has stayed steady at 75/100 since Jul 23, 2026.

257.cz

257.cz - Domény, expirované domény

Last scanned Jul 30, 2026, 9:00 PM · 6 views

Overall score

Fair

Summary

Expirované domény .cz. This website uses Nginx. SEO is fair (65/100) and accessibility is fair (60/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing canonical link.

Expirované domény .cz

Top issues to fix

12 issues found · 2 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
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.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEO
Keep a single H1 per page and demote the others to H2/H3.

+6 more issues — details in the sections below.

SEO

6 issue(s) found

100

Performance

131 ms

Security

HTTPS & header checks

Accessibility

2 issue(s) found

Score history

0 overall since Jul 23, 2026

Overall: 75
SEO: 65
Security: 75
Performance: 100
Accessibility: 60

Organization

Company details published in this site's own structured data.

Expirované domény .cz

Contact

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

Email: root@257.cz

Technologies

Detected frameworks, languages, and tools.

jQuery Nginx

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: Let's Encrypt
Subject: 257.cz
Valid from: Jul 26, 2026
Valid to: Oct 24, 2026
Days until expiry: 86
SAN domains: 257.cz, www.257.cz

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 4 · H2 5 · H3 0

Links

17 internal · 0 external · 17 broken

Images

1 total · 1 missing alt

Scripts / Styles

4 scripts · 2 stylesheets

JS / CSS size

242 B · 501 B

Page size

7.1 KB

Robots.txt & Sitemap

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

SEO issues

Missing canonical link
Multiple H1 headings found
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://257.cz
Final URL: https://257.cz
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 131 ms
HTML size: 7.1 KB
Redirect chain: https://257.cz

See something wrong on this report? Request a correction

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