udn.vn

https://udn.vn· First analyzed 29 Apr 2026· Updated 29 Apr 2026

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udn.vn

Mobile

Sponsored

Hosting Provider

VietNam Data Communication Company

IP Address

222.255.130.178

Site Location

🇻🇳 Vietnamvia tld

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS45899

Organization

VietNam Data Communication Company

Server

OpenResty

Nameservers

ns4.vdc3.vn.ns3.vdc3.vn.

Performance

Core Web Vitals

Weight

First Contentful Paint

3.5 s10%

Speed Index

4.5 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

20.5 MB

189 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

DNN (DotNetNuke)

Technology Stack

10 Technologies Detected

Libraries

CSS Frameworks

Analytics

Icon Libraries

Fonts

Web Servers

Customer Support

SEO Analysis

C60/100

Meta Tags9/15

Content11/12

Headings1/8

Technical19/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social5/5

Freshness0/4

Mobile1/4

Indexability3/3

udn.vnudn.vn

Đại học Đà Nẵng

Cổng thông tin Đại học Đà Nẵng: cập nhật tin tức, sự kiện, thông báo, tuyển sinh và hoạt động đào tạo – nghiên cứu khoa học

Title Length15 chars

Recommended: 50-60 chars (~90px / 580px)

Description Length123 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (142/156) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

4,602 URLs

robots.txt

183 rules

Sitemap reference found

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.

Sponsored

AI & LLM Readiness

F38/100

Bot Access

20/25

Machine Read.

4/25

Schema Data

0/25

Citation

14/25

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

nav

Text ratio:7%

Words:4,176

Token eff.:Poor Structure

Sections/1K:0.2

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary30w

Descriptive Headingsavg 6.7w

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

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Sponsored

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.

49/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

13/20

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

Forms & Inputs

7/15

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

5/15

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

ARIA & Roles

4/15

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

5 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.

11/100

2.60 g

CO₂e / view

20.5 MB

Page Weight

Cleaner Than

New Visitor

2.97 g

Returning (cached)

1.49 g

Annual (10K/mo)

311.9 kg

Emission Segments

Data Center

580 mg

Network

624 mg

Device

1.39 g

Resource Breakdown

JavaScript

290.8 KB

Images

16.3 MB

CSS

3.8 MB

Fonts

1.8 KB

HTML

50.1 KB

Other

157.0 KB

Green Hosting Not Verified

VietNam Data Communication Company

8 recommendations

•Carbon footprint recommendation preview...

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Security Score

36%Critical

Interactive

HTTPS

No WAF

240d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.11.2025

Valid Until

26.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.udn.vnudn.vn

SHA-256 Fingerprint

CC:F6:15:82:F0:DF:53:8B:A0:56:98:99:55:49:E5:EA:E1:67:29:0D...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache)

content-encoding

📦 Gzip(gzip)

content-type

text/html;charset=utf8

date

Wed, 29 Apr 2026 15:48:32 GMT

server

openresty

strict-transport-security

max-age=31536000

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

MX Records (1)

udn-vn.mail.protection.outlook.com

Domain Information

udn.vn

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

63/100

Mobile Friendly14 breakpoints

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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Roboto-Black + Roboto

WCAG Partial

37/100

Readability

/30

11/30

13px · LH 1.30

Hierarchy

/20

7/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

5/25

4 fonts · 17 req

Heading Font

Roboto-Black

Sans

Body Font

Roboto

Sans13px

Contrast Ratio

1:1

19 issues

Reading Comfort

~45 CPL

Narrow lines

36px

21px

13px

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Tight line spacing (1.30). Increase to 1.4–1.6 for better readability.

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 19 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

GGoogle Fonts Buy on MyFontsFlesch 0

Color Palette

14 unique colors

6.36:1 AA Light

#ffffff

Background· 19.400000000000002%

#695c61

Other· 7%

#0c7ed7

Primary· 0%

#d8e8f0

Secondary· 12.1%

#0c0c11

Secondary· 9.8%

#234971

Primary· 8.9%

#8c9eab

Secondary· 7.1%

#1c659b

Accent· 6.4%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(9)googletagmanager.com(2)google-analytics.com(1)cdnjs.cloudflare.com(1)back(1)

Website Identity

udn.vn

Location detected: 🇻🇳 Vietnamvia tld

📧 Microsoft 365vi-VN

Social Profiles

Facebook YouTube

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Last analyzed: 29 Apr 2026 at 15:49

Historical Analysis & Change Tracking