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alu.cn

https://alu.cn· First analyzed 05 May 2026· Updated 05 May 2026
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alu.cn
Desktop screenshot of alu.cn
Mobile screenshot of alu.cn
Mobile

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Hosting Provider

IP Address

183.131.19.72

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Jilin, China

ASN

AS58461

Organization

Jilin province high technology Co., Ltd.

CDN

Cloudflare

WAF

Cloudflare

Nameservers

harmony.ns.cloudflare.com.anirban.ns.cloudflare.com.

Performance

84

Core Web Vitals

Weight

First Contentful Paint
1.9 s10%
Speed Index
2.4 s10%
Largest Contentful Paint
25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
22 KB
95 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Jilin province high technology Co., Ltd.
CDN
Cloudflare

Technology Stack

2 Technologies Detected

Libraries

1

CSS Frameworks

1

SEO Analysis

D56/100
13
10
1
Meta Tags9/15
Content11/12
Headings8/8
Technical6/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social1/5
Freshness0/4
Mobile4/4
Indexability3/3
A
alu.cnalu.cn

铝道网_铝产业一站式平台,专注服务铝行业

铝道网是专业的B2B铝行业平台信息网站,致力于中国铝行业的中铝公司或者个人提供铝业行情资讯(如中铝价格)、铝业信息技术(如硫酸铝的应用)、铝业知识分类(如铝分为铝合金、铝型材等等)、铝的供应求购信息(如我要铝合金门窗)、铝业人才招聘等丰富信息内容;更多信息可登陆铝道网 www.alu.cn

Title Length20 chars

Recommended: 50-60 chars (~124px / 580px)

Description Length146 chars

Recommended: 120-160 chars

Issues (1)

  • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

Crawlability

Sitemap
robots.txt

31 rules

Local SEO

Local Search Readiness

0/100
Poor
15 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

F34/100
Bot Access
20/25
Machine Read.
9/25
Schema Data
0/25
Citation
5/25

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
def. lists
Text ratio:6%
Words:574
Token eff.:Optimal
Sections/1K:73.2
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary19w
Descriptive Headingsavg 1w
Canonical URL
Open Graph1/3
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.
D
58/100
6
Passed
6
Critical
1
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
8/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
10/15
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.
4 recommendations
  • Accessibility recommendation preview...

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.
67/100
A+
2 mg
CO₂e / view
21.8 KB
Page Weight
95%
Cleaner Than
New Visitor
3 mg
vs
Returning (cached)
1 mg
Annual (10K/mo)
264 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
1 mg
Resource Breakdown
Images
1.4 KB
HTML
18.4 KB
Other
2.0 KB
Green Hosting Verified
Cloudflare
GWF Verified
3 recommendations
  • Carbon footprint recommendation preview...
F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

257d

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

HTTP Protocol

HTTP/2

Valid From

16.12.2025

Valid Until

17.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.alu.cnalu.cn

SHA-256 Fingerprint

C6:BC:8C:C7:C5:FE:AD:57:3B:EB:2D:93:82:7D:FE:0C:FF:43:D3:94...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

accept-ranges
bytes
content-encoding
📦 Gzip(gzip)
content-length
18575
content-type
text/html; charset=gb2312
date
Tue, 05 May 2026 02:44:12 GMT
etag
"7070aff137dcdc1:0"
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

20

SPF
DKIM
DMARC

MX Records (1)

mx.mail.ym.163.com

Domain Information

alu.cn

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.
F
34/100
Not 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.
3 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

微软雅黑

WCAG Partial
45/100
Readability
/30
4/30

12px · LH 2.50

Hierarchy
/20
13/20

1x ratio · ✓ H1→H6

WCAG
/25
14/25

2.32:1 min contrast

Performance
/25
14/25

2 fonts

Heading Font

微软雅黑

Sans12px

Body Font

微软雅黑

Sans12px

Contrast Ratio

2.32:1

12 issues

Reading Comfort

~138 CPL

Too wide
12px
h1
24px
h2
24px
h3
13px
h4
12px
p
Minor Third
Scale

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide line spacing (2.50). 1.4–1.6 is optimal for body text.

❌ Very long lines: ~138 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 12 elements below WCAG AA threshold (min 2.3:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

Color Palette

8 unique colors
2.94:1 Fail Light
#ffffff
Background· 47.599999999999994%
#9b9596
Other· 5.5%
#e62320
Primary· 8%
#a30e0d
Accent· 5.5%
#e8885c
Accent· 4.4%
#f7e3ce
Accent· 3.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

10 Resources

8
Scripts
2
Styles
0
Async
0
Defer

Top Script Sources

meta.alu.cn(6)zz.bdstatic.com(1)hm.baidu.com(1)

Website Identity

alu.cn

Location detected: 🇨🇳 Chinavia tld

Social Profiles

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Last analyzed: 05 May 2026 at 02:44

Historical Analysis & Change Tracking