21ic.com
21IC电子网 - 电子工程师的优选网站
Last scanned Jul 26, 2026, 12:19 PM
Overall score
Fair
Summary
21IC电子网，电子工程师的优选网站(嵌入式,单片机,DSP,EDA,测试测量,元器件,医疗电子,智能电网). This website uses Nginx. SEO is fair (70/100) and accessibility is good (80/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.
21IC电子网，电子工程师的优选网站(嵌入式,单片机,DSP,EDA,测试测量,元器件,医疗电子,智能电网)
Top issues to fix
12 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+6 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
533 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
21IC电子网，电子工程师的优选网站(嵌入式,单片机,DSP,EDA,测试测量,元器件,医疗电子,智能电网)
Contact
Email, phone, and address published on this site's own pages.
- macysun@21ic.com
Meta tags
- Title
- 21IC电子网 - 电子工程师的优选网站
- Description
- 21IC电子网，电子工程师的优选网站(嵌入式,单片机,DSP,EDA,测试测量,元器件,医疗电子,智能电网)
- Canonical
- Language
- zh-cmn-Hans
- Charset
- UTF-8
- Viewport
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
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
- *.21ic.com
- Valid from
- Feb 4, 2026
- Valid to
- Mar 5, 2027
- Days until expiry
- 220
- SAN domains
- *.21ic.com, 21ic.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: none · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 10 · H3 63
Links
190 internal · 346 external · 20 broken
Images
80 total · 18 missing alt
Scripts / Styles
37 scripts · 4 stylesheets
JS / CSS size
7.8 KB · 489 B
Page size
213 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- More than 20% of images are missing alt text
- Missing viewport meta tag
Scan details
- Requested URL
- https://21ic.com
- Final URL
- https://www.21ic.com/
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 529 ms
- HTML size
- 213 KB
- Redirect chain
- https://21ic.com → https://www.21ic.com/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does 21ic.com use?
- 21ic.com is built with jQuery, Google Analytics, Nginx.
- Is 21ic.com secure (HTTPS)?
- Yes. 21ic.com uses TLS 1.3 with a certificate issued by DigiCert Inc, valid until Mar 5, 2027.
- Who hosts 21ic.com?
- Hosting provider information for 21ic.com is not available yet.
- What is 21ic.com's SEO score?
- 21ic.com scored 70/100 for SEO in the latest analysis (fair).
- What is 21ic.com's overall website score?
- 21ic.com has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card