What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

12306.cn

https://12306.cn· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

12306.cn

Sponsored

Hosting Provider

China Telecom

IP Address

60.188.105.23

Server Location

🇨🇳 Taizhou, China

ASN

AS136190

Server

waf/4.40.0-0.el7

CDN

Performance

Page Speed

4.9 MB

91 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

China Telecom

CDN

Technology Stack

2 Technologies Detected

Libraries

jQuery

CSS Frameworks

Tailwind CSS

SEO Analysis

D41/100

12306.cn12306.cn

中国铁路12306网站

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Missing viewport meta tag - page may not be mobile-friendly

8 issues found

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Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

260d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

China Financial Certification Authority

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

09.10.2025

Valid Until

04.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.12306.cn12306.cn

SHA-256 Fingerprint

80:8B:A6:3F:46:04:86:BD:D8:CF:58:03:36:27:29:BB:8D:D4:C8:A1...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

38695

connection

keep-alive

content-length

1480

content-type

text/html

date

Mon, 16 Feb 2026 12:32:39 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

12306.cn

DNSSEC

Not Enabled

Typography & Readability

Helvetica Neue

38/100

Readability

/30

32/40

14px · LH 1.57

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Sans14px

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

Reading Comfort

~156 CPL

Needs attention

14px

Minor Second

Scale

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.57 ratio ensures comfortable reading.

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

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

✅ Consistent design: Single font family with weight variations is a modern best practice.

⚠️ Risky: Text appears on background images without overlay protection.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

kyfw.12306.cn(10).(4)

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Last analyzed: 16 Feb 2026 at 12:33

Historical Analysis & Change Tracking