susta.vn

https://susta.vn· First analyzed 18 May 2026· Updated 18 May 2026

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susta.vn

Mobile

Sponsored

Hosting Provider

Vietnam Posts and Telecommunications Group

IP Address

123.31.40.46

Site Location

🇻🇳 Vietnamvia tld

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS135905

Organization

Vietnam Posts and Telecommunications Group

Nameservers

ns2.vdconline.vn.ns1.vdconline.vn.

Performance

Core Web Vitals

Weight

First Contentful Paint

3.6 s10%

Speed Index

4.7 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

5.8 MB

162 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Vietnam Posts and Telecommunications Group

Technology Stack

8 Technologies Detected

Libraries

CSS Frameworks

Other

Icon Libraries

Frameworks

Customer Support

SEO Analysis

D42/100

Meta Tags9/15

Content3/12

Headings0/8

Technical11/21

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

susta.vnsusta.vn

Liên hiệp các hội Khoa học & Kỹ thuật tỉnh Sơn La

No description available for this page.

Title Length49 chars

Recommended: 50-60 chars (~297px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (4)

• Missing meta description — important for click-through rates in SERPs
• Very thin content (12 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1

9 issues found

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Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

F23/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

0/25

Citation

2/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:4%

Words:3,681

Token eff.:Poor Structure

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

66/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

6/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

7/100

731 mg

CO₂e / view

5.8 MB

Page Weight

Cleaner Than

New Visitor

836 mg

Returning (cached)

418 mg

Annual (10K/mo)

87.8 kg

Emission Segments

Data Center

163 mg

Network

176 mg

Device

392 mg

Resource Breakdown

JavaScript

573.2 KB

Images

4.7 MB

CSS

37.0 KB

HTML

498.2 KB

Other

13.0 KB

Green Hosting Not Verified

Vietnam Posts and Telecommunications Group

10 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

193d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

Valid From

12.05.2026

Valid Until

27.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.susta.vnsusta.vn

SHA-256 Fingerprint

A5:EA:9E:FF:7A:D9:78:F7:E4:45:26:0D:9B:4B:5D:6B:50:CC:31:2C...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟣 Private(private)

content-length

509850

content-type

text/html; charset=utf-8

date

Mon, 18 May 2026 02:11:59 GMT

x-frame-options

SAMEORIGIN

x-powered-by

ASP.NET

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

susta.vn

DNSSEC

Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

65/100

Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

Arial

WCAG Partial

61/100

Readability

/30

17/30

16px · LH 1.10

Hierarchy

/20

6/20

WCAG

/25

18/25

3.81:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Arial

Body Font

Arial

Sans16px

Contrast Ratio

3.81:1

1 issue

Reading Comfort

~62 CPL

Optimal (45–75)

16px

✅ Excellent readability: 16px body text is ideal for all devices.

⚠️ Tight line spacing (1.10). Increase to 1.4–1.6 for better readability.

✅ Optimal line length: ~62 chars/line (ideal 45–75 CPL).

⚠️ Hard to read: Flesch score 37/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 3.8:1).

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

Flesch 37

Color Palette

9 unique colors

Light

#ffffff

Background· 36.6%

#ddd6bb

Primary· 17.5%

#ecebe8

Secondary· 12.3%

#277d76

Accent· 6.9%

#a6828e

Secondary· 6.9%

#23234b

Secondary· 5.8%

#9d3059

Accent· 5%

#90b1ae

Secondary· 4.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(20)

Website Identity

susta.vn

Location detected: 🇻🇳 Vietnamvia tld

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Last analyzed: 18 May 2026 at 02:12

Historical Analysis & Change Tracking