What technology does 4.cn use?

4.cn is built with PHP, jQuery, Google Analytics, Nginx.

Is 4.cn secure (HTTPS)?

Yes. 4.cn uses TLS 1.2 with a certificate issued by Let's Encrypt, valid until Sep 6, 2026.

Hosting provider information for 4.cn is not available yet.

What is 4.cn's SEO score?

4.cn scored 65/100 for SEO in the latest analysis (fair).

What is 4.cn's overall website score?

4.cn has an overall SiteGraph score of 74/100, combining SEO, performance, security, and accessibility.

Has 4.cn's score changed over time?

4.cn's overall score has improved by 4 points (from 70 to 74) since Jul 21, 2026.

4.cn

4.CN - Buy, Sell & Park Domain Names

Last scanned Jul 29, 2026, 7:00 PM · 13 views

Overall score

Fair

Summary

4.CN is the global and professional marketplace for buying and selling domain names. This website uses PHP. SEO is fair (65/100) and accessibility is fair (65/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.

4.CN is the global and professional marketplace for buying and selling domain names. We have over 1.500.000 domains in our marketplace. Currently we are the leading domain auction platform and domain escrow service provider in China now.

Top issues to fix

14 issues found · 4 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.
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 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.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

+8 more issues — details in the sections below.

SEO

6 issue(s) found

100

Performance

657 ms

Security

HTTPS & header checks

Accessibility

2 issue(s) found

Score history

+4 overall since Jul 21, 2026

Overall: 74
SEO: 65
Security: 65
Performance: 100
Accessibility: 65

Organization

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

Facebook X (Twitter)

Contact

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

Email: Kiki@4.CN

Meta tags

Title: 4.CN - Buy, Sell & Park Domain Names
Description: 4.CN is the global and professional marketplace for buying and selling domain names. We have over 1.500.000 domains in our marketplace. Currently we are the leading domain auction platform and domain escrow service provider in China now.
Canonical
Language: en
Charset: utf-8
Viewport
Robots meta: all, index, follow, noodp
Manifest

Technologies

Detected frameworks, languages, and tools.

PHP jQuery Google Analytics 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 1.2
Issuer: Let's Encrypt
Subject: *.4.cn
Valid from: Jun 8, 2026
Valid to: Sep 6, 2026
Days until expiry: 38
SAN domains: *.4.cn, 4.cn

Security headers

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

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 1 · H2 4 · H3 0

Links

81 internal · 13 external · 20 broken

Images

14 total · 9 missing alt

Scripts / Styles

16 scripts · 5 stylesheets

JS / CSS size

10.0 KB · 552 B

Page size

46.7 KB

Robots.txt & Sitemap

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

SEO issues

Meta description longer than 160 characters
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://4.cn
Final URL: https://www.4.cn/
HTTP status: 200
HTTP version: HTTP/2
Response time: 657 ms
HTML size: 46.7 KB
Redirect chain: https://4.cn → https://www.4.cn/

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Frequently asked questions

What technology does 4.cn use?: 4.cn is built with PHP, jQuery, Google Analytics, Nginx.
Is 4.cn secure (HTTPS)?: Yes. 4.cn uses TLS 1.2 with a certificate issued by Let's Encrypt, valid until Sep 6, 2026.
Who hosts 4.cn?: Hosting provider information for 4.cn is not available yet.
What is 4.cn's SEO score?: 4.cn scored 65/100 for SEO in the latest analysis (fair).
What is 4.cn's overall website score?: 4.cn has an overall SiteGraph score of 74/100, combining SEO, performance, security, and accessibility.
Has 4.cn's score changed over time?: 4.cn's overall score has improved by 4 points (from 70 to 74) since Jul 21, 2026.