51aspx.com

https://51aspx.com· First analyzed 01 May 2026· Updated 01 May 2026

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51aspx.com

Mobile

Sponsored

Hosting Provider

Alibaba Cloud

alibabacloud.com

IP Address

47.117.68.185

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Shanghai, China

ASN

AS37963

Organization

Alibaba.com LLC

Nameservers

dns3.hichina.com.dns4.hichina.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.1 s10%

Speed Index

1.5 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

11.8 MB

250 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Alibaba Cloud

Technology Stack

9 Technologies Detected

CSS Frameworks

Analytics

Frameworks

Libraries

Other

Tag Managers

SEO Analysis

D50/100

Meta Tags10/15

Content11/12

Headings1/8

Technical11/25

E-E-A-T0/7

Images3/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

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Title Length34 chars

Recommended: 50-60 chars (~204px / 580px)

Description Length86 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

14 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

8/100

Poor

2 13 2

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

Sponsored

AI & LLM Readiness

F35/100

Bot Access

20/25

Machine Read.

12/25

Schema Data

0/25

Citation

3/25

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:13%

Words:1,613

Token eff.:Optimal

Sections/1K:0.6

Depth:1/5

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 (10)

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.

60/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

12/20

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

5/15

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

ARIA & Roles

3/15

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

4 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.

13/100

1.49 g

CO₂e / view

11.8 MB

Page Weight

Cleaner Than

New Visitor

1.70 g

Returning (cached)

851 mg

Annual (10K/mo)

178.7 kg

Emission Segments

Data Center

333 mg

Network

357 mg

Device

799 mg

Resource Breakdown

JavaScript

189.6 KB

Images

11.4 MB

CSS

89.0 KB

HTML

52.8 KB

Other

8.3 KB

Green Hosting Not Verified

Alibaba Cloud

8 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

21%Critical

Interactive

HTTPS

No WAF

82d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

24.04.2026

Valid Until

23.07.2026

Subject Alternative Names (1)

www.51aspx.com

SHA-256 Fingerprint

51:D1:C8:77:1C:3B:D0:77:12:B8:CD:87:90:9E:40:A3:7B:06:B5:E2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=2592000

cache-control

🟡 60s(public,max-age=60)

content-encoding

zstd

content-type

text/html; charset=utf-8

date

Fri, 01 May 2026 22:05:36 GMT

vary

Accept-Encoding

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

m1.feishu.cn

Domain Information

51aspx.com

Domain Age

20y 4m

Created

21.12.2005

Expires

21.12.2026

Last Updated

06.12.2025

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

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.

62/100

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

1 recommendation

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

微软雅黑

WCAG Partial

53/100

Readability

/30

14/30

12px · LH 1.43

Hierarchy

/20

12/20

3x ratio

WCAG

/25

14/25

1.09:1 min contrast

Performance

/25

13/25

1 font · 1 req

Heading Font

微软雅黑

Sans36px

Body Font

微软雅黑

Sans12px

Contrast Ratio

1.09:1

16 issues

Reading Comfort

~63 CPL

Optimal (45–75)

36px

30px

14px

12px

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

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

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

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

⚠️ Partial contrast: 16 elements below WCAG AA threshold (min 1.1:1).

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

Buy on MyFontsFlesch 0

Color Palette

10 unique colors

3.3:1 AA Large Light

#ffffff

Background· 32.4%

#9b8897

Secondary· 3.4%

#4060da

Primary· 28%

#80514f

Secondary· 8.8%

#2f48a4

Accent· 5.9%

#7db9a6

Secondary· 4.3%

#445ab5

Secondary· 0.7%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)googletagmanager.com(2)hm.baidu.com(1)google-analytics.com(1)

Website Identity

51aspx.com

20 years old

Location detected: 🇨🇳 Chinavia ip

Alibaba Cloud Computing (Beijing) Co., Ltd.

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 01 May 2026 at 22:06

Historical Analysis & Change Tracking