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51.com

https://51.com· First analyzed 26 Apr 2026· Updated 26 Apr 2026
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51.com
Desktop screenshot of 51.com
Mobile screenshot of 51.com
Mobile

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Hosting Provider

IP Address

119.167.249.58

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Jinan, China

ASN

AS4837

Server

OpenResty

Performance

77

Core Web Vitals

Weight

First Contentful Paint
2.6 s10%
Speed Index
3.4 s10%
Largest Contentful Paint
25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
551 KB
105 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
CNC Group CHINA169 Shandong Province Network

Technology Stack

5 Technologies Detected

Libraries

2

UI Components

1

CSS Frameworks

1

Web Servers

1

SEO Analysis

D50/100
13
9
3
Meta Tags14/15
Content9/12
Headings1/8
Technical8/25
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile1/4
Indexability3/3
5
51.com51.com

五一网|51游戏_好玩的游戏社区化平台_51游戏官网|51页游|空间尽在51.com

玩游戏,上51.COM。51游戏平台是国内知名的专业游戏社区化平台,在这里玩家们可以尽情体验畅玩游戏、讨论游戏、共创游戏的快乐。创立20多年来,51游戏已集游戏研发、游戏运营为一体,不断为玩家提供高品质、好玩的游戏产品,为玩家提供真诚的服务。

Title Length42 chars

Recommended: 50-60 chars (~245px / 580px)

Description Length121 chars

Recommended: 120-160 chars

Issues (3)

  • Missing H1 tag — every page should have exactly one H1
  • Most images missing alt text (59/73) — critical for accessibility and SEO
  • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

Crawlability

Sitemap
robots.txt

12 rules

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

F34/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
7/25

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:2%
Words:482
Token eff.:Optimal
Sections/1K:12.4

Structured Data

No Schema

Citation Readiness

Opening Summary64w
Descriptive Headingsavg 1w
Canonical URL
Open Graph3/3
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.
F
38/100
5
Passed
9
Critical
2
Warnings
Images & Alt Text
5/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
4/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
3/15
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
2/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
9/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
5 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.
47/100
A
68 mg
CO₂e / view
551.4 KB
Page Weight
80%
Cleaner Than
New Visitor
78 mg
vs
Returning (cached)
39 mg
Annual (10K/mo)
8.2 kg
Emission Segments
Data Center
15 mg
Network
16 mg
Device
37 mg
Resource Breakdown
Images
532.4 KB
HTML
19.0 KB
Green Hosting Not Verified
CNC Group CHINA169 Shandong Province Network
6 recommendations
  • Carbon footprint recommendation preview...
F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

257d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

09.12.2025

Valid Until

08.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.51.com51.com

SHA-256 Fingerprint

ED:6D:4A:37:5D:84:EB:C0:A2:DB:B2:AC:86:BE:F7:E5:DE:A5:6F:EA...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-store, no-cache, must-revalidate)
connection
keep-alive
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=UTF-8
date
Sun, 26 Apr 2026 20:35:06 GMT
expires
Thu, 19 Nov 1981 08:52:00 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

51.com

Domain Age
27y 9m

Created

10.07.1998

Expires

09.07.2028

Last Updated

05.06.2024

Registrar

Xin Net Technology Corporation

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
31/100
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.
4 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

Microsoft Yahei

WCAG Partial
48/100
Readability
/30
15/30

14px · LH 1.50

Hierarchy
/20
5/20
WCAG
/25
14/25

1:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans14px

Contrast Ratio

1:1

15 issues

Reading Comfort

~156 CPL

Too wide
16px
h3
14px
p

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

❌ Very long lines: ~156 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 1.0:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

Color Palette

15 unique colors
5.17:1 AA Light
#ffffff
Background· 15.399999999999999%
#74697e
Secondary· 6.2%
#f6f4ea
Primary· 8.8%
#393044
Secondary· 8.6%
#c8685c
Secondary· 6.8%
#381d26
Secondary· 6.2%
#7e96b6
Secondary· 6.2%
#7b3039
Secondary· 5.9%

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

23 Resources

13
Scripts
10
Styles
0
Async
0
Defer

Top Script Sources

cdn.51img1.com(6)cdn3.51img1.com(5)zz.bdstatic.com(1)hm.baidu.com(1)

Website Identity

51.com

27 years old
Location detected: 🇨🇳 Chinavia ip
Xin Net Technology Corporation

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Last analyzed: 26 Apr 2026 at 20:35

Historical Analysis & Change Tracking