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k12online.vn

Trường học số K12Online

Last scanned Jul 27, 2026, 5:43 PM

86

Overall score

Great

Summary

Trường học số K12Online. This website uses Google Analytics hosted on VIETEL-AS-AP - Viettel Group, VN. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance good (80/100). Top issue: Missing canonical link.

Trường học số K12Online

Vietnam
Hosted on VIETEL-AS-AP - Viettel Group, VN

Top issues to fix

6 issues found

  • 1 cookie without Secure/HttpOnly flags

    Security

    Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

  • Missing canonical link

    SEO

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

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

  • No structured data (JSON-LD) found

    SEO

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

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

70

SEO

5 issue(s) found

80

Performance

337 ms

100

Security

HTTPS & header checks

100

Accessibility

0 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.

Trường học số K12Online

YouTubeYouTube

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

OpenGraph & Twitter Card

OpenGraph

og:title
Trường học số K12Online
og:description
—
og:type
website
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google Analytics

Hosting & CDN

CDN provider
—
IP address
117.5.141.225
ASN
AS7552 (VIETEL-AS-AP - Viettel Group, VN)

DNS records

TypeValue
A
  • 117.5.141.225
AAAA—
MX—
TXT
  • ZOOM_verify_Rlo_nOdNQ_21o0sA5_uaHw
NS
  • dns1.vietel.com.vn
  • dns2.vietel.com.vn
CAA—
CNAME—
IPv6 supportNo

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
128
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 · 0 broken

Images

87 total · 0 missing alt

Scripts / Styles

5 scripts · 3 stylesheets

JS / CSS size

353 KB · 762 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.

Careers

View careers page

This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.

Scan details

Requested URL
https://k12online.vn
Final URL
https://k12online.vn
HTTP status
200
HTTP version
HTTP/1.1
Response time
335 ms
HTML size
99.6 KB
Redirect chain
https://k12online.vn

See something wrong on this report? Request a correction

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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?
k12online.vn is hosted on VIETEL-AS-AP - Viettel Group, VN.
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 86/100, combining SEO, performance, security, and accessibility.
Is k12online.vn hiring?
k12online.vn has a careers page; check it directly for current openings.