51jiaoxi.com

We performed a comprehensive analysis of 51jiaoxi.com on 2026-07-02. The website returned an HTTP 200 status code with a server response time of 22366ms. The page is served over HTTP/2 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 1072 KB, and the site is served behind a CDN (Content Delivery Network). Warning: The website does not have a valid SSL certificate. Visitors may see security warnings in their browser, and data transmitted to and from this website is not encrypted. The security headers analysis reveals a score of 0/100 (poor). No security headers are configured, which is a significant security concern. However, the site is missing Content-Security-Policy, Strict-Transport-Security (HSTS), X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy, which could expose the site and its users to cross-site scripting (XSS), clickjacking, and other web-based attacks. Our technology detection scan identified 4 technologies across 4 categories powering 51jiaoxi.com. The detected stack includes Vite, Google Analytics 4, StackPath, and jQuery 2.0.0.. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, 51jiaoxi.com receives an overall trust score of 53/100, classified as "Caution Advised".

After conducting a thorough safety and legitimacy analysis, 51jiaoxi.com receives a trust score of 53/100, which places it in the "Caution Advised" category. This score is calculated by evaluating multiple factors including SSL certificate validity, domain registration history, email authentication protocols, security header configuration, and blacklist status across major threat intelligence databases. The analysis identified several positive trust signals: a valid HTTPS connection protecting data in transit and a well-established domain registered for over 8.2 years, indicating long-term commitment and legitimacy. Areas of concern include: the absence of a Content-Security-Policy header, which leaves the site more vulnerable to cross-site scripting (XSS) attacks, no X-Frame-Options header, which could allow the site to be embedded in malicious iframes (clickjacking), missing Referrer-Policy, potentially leaking URL information to third parties, the domain's WHOIS information is hidden behind a privacy service, making it harder to verify the owner's identity, and DNSSEC is not enabled, leaving DNS queries vulnerable to spoofing attacks. While these issues don't necessarily indicate malicious intent, they represent areas where the website's security posture could be improved. We checked 51jiaoxi.com against 8 major blacklist databases including Google Safe Browsing, Phishtank, Urlhaus, Openphish, Dnsfilter, Spamhaus Dbl, Surbl, and Virustotal. The domain passed all 8 checks with a clean status, meaning it has not been flagged for phishing, malware distribution, spam, or other malicious activities by any of the tested threat intelligence providers. The domain is registered through Alibaba Cloud Computing (Beijing) Co., Ltd. based in CN, with a registration date of 2018-05-08 and expiration date of 2027-05-08.

Our technology detection engine scanned 51jiaoxi.com and identified 4 distinct technologies across 4 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records. Build Tool: Vite — bundles and optimizes the JavaScript and CSS assets for 51jiaoxi.com. Analytics: Google Analytics 4 — tracks visitor behavior and provides traffic insights for 51jiaoxi.com. CDN: StackPath — accelerates content delivery by caching assets at edge locations worldwide for 51jiaoxi.com. JavaScript Library: jQuery (version 2.0.0.) — provides utility functions and DOM manipulation for 51jiaoxi.com. We also extracted the following tracking identifiers: Google Analytics 4 Measurement ID G-0FY3RJH4F9. These IDs can be used to identify other websites operated by the same organization.

51jiaoxi.com delivers its homepage in 22366ms (server response time), which is considered slow by industry standards. The total page weight is 1072 KB, and we detected 2226 resource requests loading assets from 40 third-party domains. A high number of third-party domains can significantly impact page load time due to additional DNS lookups and TLS handshakes required for each domain. The website uses Gzip compression for text-based assets, achieving an estimated 60.0% reduction in transfer size. This reduces bandwidth usage and improves page load times, especially for visitors on slower connections. Asset minification status: 2 out of 3 CSS files and 3 out of 5 JavaScript files are minified. Minifying the remaining 3 unminified file(s) could further reduce page weight by 10-30% for those assets. Minification is a best practice that reduces download sizes without affecting functionality. The site is served through a Content Delivery Network (CDN), which caches static assets at edge servers around the world. This means visitors from different geographic regions receive content from the nearest edge server, significantly reducing latency. CDN usage is particularly important for websites with a global audience, as it can reduce page load times by 40-60% for distant visitors. From an environmental perspective, each page view of 51jiaoxi.com produces approximately 0.52g of CO₂, earning a carbon rating of D. The website's carbon footprint could be reduced by optimizing images, enabling compression, reducing third-party scripts, and leveraging caching. For reference, the average web page produces about 0.5g of CO₂ per page view. The page weight of 1072 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for 51jiaoxi.com. This typically means the site doesn't have enough real-world Chrome user traffic to generate statistically significant field data, or the domain is not included in the CrUX dataset. Core Web Vitals (LCP, INP, CLS) are important Google ranking factors that measure real user experience.

51jiaoxi.com resolves to the IPv4 address 101.227.5.175, but does not support IPv6. IPv6 adoption is increasingly important as IPv4 address space becomes exhausted, and some ISPs and regions are transitioning to IPv6-only connectivity. The domain has 1 A record(s) configured. SPF is not configured, meaning any server could potentially send emails pretending to be from this domain. This is a significant email security concern. DMARC is not configured, leaving the domain vulnerable to email spoofing and phishing attacks that impersonate this domain. DKIM was not detected. Without DKIM, recipients cannot cryptographically verify that emails claiming to be from this domain are authentic. DNSSEC is not enabled for 51jiaoxi.com. While not critical for most websites, DNSSEC adds an important security layer by ensuring DNS responses haven't been tampered with during transit. Enabling DNSSEC is recommended for domains handling sensitive data or financial transactions. The domain is registered through Alibaba Cloud Computing (Beijing) Co., Ltd. (CN). It was first registered on 2018-05-08 and is set to expire on 2027-05-08, making it 8.2 years old. Our subdomain enumeration scan discovered 4 active subdomains for 51jiaoxi.com: admin.51jiaoxi.com, m.51jiaoxi.com, mail.51jiaoxi.com, and www.51jiaoxi.com. Active subdomains can reveal the organization's infrastructure, including development environments, API endpoints, and third-party service integrations.

The homepage of 51jiaoxi.com contains 3,076 words of visible text content. This is a substantial amount of content that provides good opportunities for search engine indexing. The page is structured with 0 H2 headings, 5 H3 headings, 124 H4 headings. The page includes 45 images. 28 images (62%) are missing alt text attributes, which is a significant concern for both accessibility and SEO. Screen readers rely on alt text to describe images to visually impaired users, and search engines use alt text to understand image content. Only 38% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 608 internal links pointing to other pages on the same domain and 49 external links pointing to third-party websites. The high number of internal links suggests a well-interconnected site structure, which helps search engines discover and crawl all pages efficiently. There are 5 external JavaScript files, 3 CSS stylesheets, and 0 iframes on the page. The site implements the following web standards and features: Progressive Web App (PWA) manifest (enabling app-like installation). Notable missing features: XML Sitemap, robots.txt, and Schema.org structured data. Adding these could improve search engine discoverability and rich result eligibility.

The title tag for 51jiaoxi.com is good at 27 characters: "教习网-PPT课件,教案,试题试卷-精选教学资源下载网". The length is acceptable, though it may be slightly truncated in some search result displays. The meta description is 113 characters (well-optimized): "教习网精选小学、初中、高中、中职语文、数学、英语、道德与法治、科学、物理、化学、生物、历史、地理、政治等学科课堂教学所需的PPT课件、教案教学设计、试题试卷等资源下载，涵盖部编版、人教版、北师大版等主流版本，助老师们轻松备课！". Google typically displays up to 155-160 characters of the meta description in search results. A compelling meta description with a clear call-to-action can significantly improve click-through rates from search results. The page language is declared as zh-cn and a favicon is configured. Open Graph meta tags are configured with 2/4 recommended fields: OG title ("教习网-PPT课件,教案,试题试卷-精选教学资源下载网..."), OG image (social sharing thumbnail), These tags control how the page appears when shared on Facebook, LinkedIn, and other social media platforms that support the Open Graph protocol. The meta keywords tag contains 5 terms including PPT课件下载, 教案下载, 试题下载, 试卷下载, and 教学资源. Note: Google has officially confirmed that it does not use the meta keywords tag as a ranking signal. However, some other search engines (Bing, Yandex) may still reference it.