k12online.vn
Trường học số K12Online
Last scanned Aug 5, 2026, 7:00 AM · 17 views
Overall score
Great
Summary
Trường học số K12Online. This website uses Google Analytics. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance excellent (90/100). Top issue: Missing canonical link.
Trường học số K12Online
Top issues to fix
7 issues found
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
+1 more issue — details in the sections below.
SEO
5 issue(s) found
Performance
307 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
+3 overall since Jul 27, 2026
- Overall
- 89
- SEO
- 70
- Security
- 100
- Performance
- 90
- Accessibility
- 100
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Trường học số K12Online
- Description
- Trường học số K12Online
- Canonical
- Language
- vi
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0, user-scalable=no
- 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 1.2
- Issuer
- Sectigo Limited
- Subject
- *.k12online.vn
- Valid from
- Dec 2, 2025
- Valid to
- Dec 2, 2026
- Days until expiry
- 119
- SAN domains
- *.k12online.vn, k12online.vn
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 3 cookie(s) observed
Content & assets
Headings
H1 5 · H2 0 · H3 0
Links
12 internal · 6 external · 18 broken
Images
87 total · 0 missing alt
Scripts / Styles
5 scripts · 3 stylesheets
JS / CSS size
28.8 KB · 11.2 KB
Page size
99.6 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
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://k12online.vn
- Final URL
- https://k12online.vn
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 305 ms
- HTML size
- 99.6 KB
- Redirect chain
- https://k12online.vn
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Frequently asked questions
- What technology does k12online.vn use?
- k12online.vn is built with Google Analytics.
- Is k12online.vn secure (HTTPS)?
- Yes. k12online.vn uses TLS 1.2 with a certificate issued by Sectigo Limited, valid until Dec 2, 2026.
- Who hosts k12online.vn?
- Hosting provider information for k12online.vn is not available yet.
- What is k12online.vn's SEO score?
- k12online.vn scored 70/100 for SEO in the latest analysis (fair).
- What is k12online.vn's overall website score?
- k12online.vn has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.
- Has k12online.vn's score changed over time?
- k12online.vn's overall score has improved by 3 points (from 86 to 89) since Jul 27, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card