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SGSiteGraph

cas.cn

中国科学院

Last scanned Jul 25, 2026, 12:25 AM · 2 views

70

Overall score

Fair

Summary

This website uses jQuery hosted on CSTNET-AS-AP - Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS), CN. SEO is fair (50/100) and accessibility is fair (50/100). Security scores excellent (90/100) and performance excellent (90/100). Top issue: Missing meta description.

China
Hosted on CSTNET-AS-AP - Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS), CN

Top issues to fix

11 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 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.

  • 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 canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+5 more issues — details in the sections below.

50

SEO

7 issue(s) found

90

Performance

679 ms

90

Security

HTTPS & header checks

50

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
中国科学院
Description
Canonical
Language
Charset
utf-8
Viewport
width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no
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.

jQuery

Hosting & CDN

CDN provider
—
IP address
159.226.242.61
ASN
AS7497 (CSTNET-AS-AP - Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS), CN)

DNS records

TypeValue
A
  • 159.226.242.61
AAAA
  • 2400:dd01:1017:1000::9fe2:f23d
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
China Financial Certification Authority
Subject
*.cas.cn
Valid from
Nov 20, 2025
Valid to
Dec 18, 2026
Days until expiry
146
SAN domains
*.cas.cn, cas.cn

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyEnabled
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

243 internal · 66 external · 1 broken

Images

119 total · 118 missing alt

Scripts / Styles

15 scripts · 7 stylesheets

JS / CSS size

358 KB · 214 KB

Page size

124 KB

Robots.txt & Sitemap

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

SEO issues

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

Accessibility issues

  • Over half of images are missing alt text
  • No H1 heading found
  • Missing <html lang> attribute

Scan details

Requested URL
https://cas.cn
Final URL
https://www.cas.cn/
HTTP status
200
HTTP version
HTTP/1.1
Response time
677 ms
HTML size
124 KB
Redirect chain
https://cas.cn → http://www.cas.cn/ → https://www.cas.cn/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does cas.cn use?
cas.cn is built with jQuery.
Is cas.cn secure (HTTPS)?
Yes. cas.cn uses TLS 1.3 with a certificate issued by China Financial Certification Authority, valid until Dec 18, 2026.
Who hosts cas.cn?
cas.cn is hosted on CSTNET-AS-AP - Computer Network Information Center of Chinese Academy of Sciences (CNIC-CAS), CN.
What is cas.cn's SEO score?
cas.cn scored 50/100 for SEO in the latest analysis (fair).
What is cas.cn's overall website score?
cas.cn has an overall SiteGraph score of 70/100, combining SEO, performance, security, and accessibility.