What technology does violet.vn use?

violet.vn is built with PHP, Google Analytics, Apache.

Is violet.vn secure (HTTPS)?

Yes. violet.vn uses TLS 1.2 with a certificate issued by GlobalSign nv-sa, valid until Nov 10, 2026.

violet.vn is hosted on VTDC-AS-VN - Vietel - CHT Compamy Ltd, VN.

What is violet.vn's SEO score?

violet.vn scored 65/100 for SEO in the latest analysis (fair).

What is violet.vn's overall website score?

violet.vn has an overall SiteGraph score of 72/100, combining SEO, performance, security, and accessibility.

violet.vn

Thư viện trực tuyến ViOLET

Last scanned Jul 26, 2026, 12:25 AM · 2 views

Overall score

Fair

Summary

Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học. This website uses PHP hosted on VTDC-AS-VN - Vietel - CHT Compamy Ltd, VN. SEO is fair (65/100) and accessibility is good (85/100). Security scores good (75/100) and performance fair (65/100). Top issue: Missing canonical link.

Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học

Vietnam

Hosted on VTDC-AS-VN - Vietel - CHT Compamy Ltd, VN

Top issues to fix

12 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.
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.
Missing viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Slow estimated load (5.4s)
Performance
Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
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.

+6 more issues — details in the sections below.

SEO

5 issue(s) found

Performance

5.36 s

Security

HTTPS & header checks

Accessibility

2 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.

Organization

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

Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học

Contact

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

Email: contact@bachkim.vn hotro@violet.vn

Meta tags

Title: Thư viện trực tuyến ViOLET
Description: Mạng xã hội của cộng đồng giáo viên Việt Nam, nơi giao lưu kiến thức và chia sẻ tài nguyên dạy học
Canonical
Language: en
Charset: utf-8
Viewport
Robots meta: index, follow
Manifest

Technologies

Detected frameworks, languages, and tools.

PHP Google Analytics Apache

Hosting & CDN

Hosting provider: VTDC-AS-VN - Vietel - CHT Compamy Ltd, VN
CDN provider: —
IP address: 210.211.101.112
ASN: AS38731 (VTDC-AS-VN - Vietel - CHT Compamy Ltd, VN)

DNS records

Type	Value
A	210.211.101.112
AAAA	—
MX	alt2.aspmx.l.google.com aspmx3.googlemail.com aspmx2.googlemail.com aspmx.l.google.com aspmx5.googlemail.com aspmx4.googlemail.com alt1.aspmx.l.google.com
TXT	_globalsign-domain-verification=4N1Tf1hYO3O_0vmw4PKuHBUx-qzeVrj5dQsBqQvKZm google-site-verification=U3sa9gsl9JnEQ00JczoQj-q_IviQtBKv7om7uqDb0iA v=spf1 ip4:52.68.18.98 include:amazonses.com ~all
NS	ns1.pavietnam.vn ns2.pavietnam.vn
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.2
Issuer: GlobalSign nv-sa
Subject: *.violet.vn
Valid from: Oct 9, 2025
Valid to: Nov 10, 2026
Days until expiry: 107
SAN domains: *.violet.vn, violet.vn

Security headers

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

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 0 · H2 13 · H3 0

Links

59 internal · 7 external · 5 broken

Images

38 total · 7 missing alt

Scripts / Styles

6 scripts · 1 stylesheets

JS / CSS size

2.0 MB · 29.7 KB

Page size

30.6 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 2
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

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

Scan details

Requested URL: https://violet.vn
Final URL: https://violet.vn
HTTP status: 200
HTTP version: HTTP/1.0
Response time: 5.36 s
HTML size: 30.6 KB
Redirect chain: https://violet.vn

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