21stcentury.sg

We performed a comprehensive analysis of 21stcentury.sg on 2026-06-27. The website returned an HTTP 200 status code with a server response time of 2369ms. The page is served over HTTP/2 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 150 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 70/100 (good). The following security headers are properly configured: Content-Security-Policy, Strict-Transport-Security (HSTS), X-Frame-Options, and X-Content-Type-Options. However, the site is missing 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 11 technologies across 9 categories powering 21stcentury.sg. The detected stack includes Shopify, Bootstrap 3.4.1, Webpack, Vite, Google Analytics 4, Shop Pay, reCAPTCHA v3, Cloudflare, StackPath, jQuery 2.2.0., and Font Awesome. The primary e-commerce platform is Shopify. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, 21stcentury.sg receives an overall trust score of 72/100, classified as "Likely Safe".

After conducting a thorough safety and legitimacy analysis, 21stcentury.sg receives a trust score of 72/100, which places it in the "Likely Safe" 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, HSTS (HTTP Strict Transport Security) enforcement preventing protocol downgrade attacks, SPF (Sender Policy Framework) email authentication preventing email spoofing, DKIM (DomainKeys Identified Mail) providing cryptographic email verification, and a well-established domain registered for over 21.5 years, indicating long-term commitment and legitimacy. Areas of concern include: 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 21stcentury.sg 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 Web Commerce Communications (S) Pte Ltd based in CA, with a registration date of 2005-01-03 and expiration date of 2028-01-03.

Our technology detection engine scanned 21stcentury.sg and identified 11 distinct technologies across 9 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records. Ecommerce: Shopify — powers the online store and shopping functionality for 21stcentury.sg. CSS Framework: Bootstrap (version 3.4.1) — provides the styling and responsive layout system for 21stcentury.sg. Build Tool: Webpack and Vite — bundles and optimizes the JavaScript and CSS assets for 21stcentury.sg. Analytics: Google Analytics 4 — tracks visitor behavior and provides traffic insights for 21stcentury.sg. Payments: Shop Pay — processes payment transactions for 21stcentury.sg. Security: reCAPTCHA v3 — provides security features like bot detection and CAPTCHA for 21stcentury.sg. CDN: Cloudflare and StackPath — accelerates content delivery by caching assets at edge locations worldwide for 21stcentury.sg. JavaScript Library: jQuery (version 2.2.0.) — provides utility functions and DOM manipulation for 21stcentury.sg. Icon Set: Font Awesome — provides additional functionality for 21stcentury.sg. We also extracted the following tracking identifiers: Google Analytics 4 Measurement ID G-Q6DNJPL50T. These IDs can be used to identify other websites operated by the same organization.

21stcentury.sg delivers its homepage in 2369ms (server response time), which is considered slow by industry standards. The total page weight is 150 KB, and we detected 252 resource requests loading assets from 19 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: 4 out of 14 CSS files and 6 out of 18 JavaScript files are minified. Minifying the remaining 22 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 21stcentury.sg produces approximately 0.07g of CO₂, earning a carbon rating of A. This places the website among the cleanest on the web, demonstrating efficient use of server resources and optimized content delivery. For reference, the average web page produces about 0.5g of CO₂ per page view. The page weight of 150 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for 21stcentury.sg. 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.

21stcentury.sg resolves to the IPv4 address 23.227.38.65, 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. The domain name system is managed by 2 name servers: ns200692083.a2dns.com and ns200692084.a2dns.com. Having 2 name servers provides good redundancy — if one fails, the others can continue serving DNS queries. The choice of name servers often indicates the DNS hosting provider or CDN service being used. Email for 21stcentury.sg is handled by 21stcentury.sg with 1 MX records configured: mail.21stcentury.sg. Multiple MX records provide failover redundancy — if the primary mail server is unavailable, email will be routed to the next available server. SPF (Sender Policy Framework) is configured, which specifies which mail servers are authorized to send email on behalf of this domain. This helps prevent email spoofing and improves email deliverability. DMARC is not configured, leaving the domain vulnerable to email spoofing and phishing attacks that impersonate this domain. DKIM (DomainKeys Identified Mail) is configured, adding a cryptographic signature to outgoing emails that receiving servers can verify to confirm the email hasn't been tampered with in transit. DNSSEC is not enabled for 21stcentury.sg. 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 Web Commerce Communications (S) Pte Ltd (CA). It was first registered on 2005-01-03 and is set to expire on 2028-01-03, making it 21.5 years old. Our subdomain enumeration scan discovered 4 active subdomains for 21stcentury.sg: ftp.21stcentury.sg, mail.21stcentury.sg, webmail.21stcentury.sg, and www.21stcentury.sg. Active subdomains can reveal the organization's infrastructure, including development environments, API endpoints, and third-party service integrations.

The homepage of 21stcentury.sg contains 597 words of visible text content. This is a moderate amount of content. The page is structured with 5 H2 headings, 7 H3 headings, 1 H4 headings, 14 H5, and 0 H6 headings. The page includes 38 images. 23 images (61%) 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 39% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 103 internal links pointing to other pages on the same domain and 26 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 18 external JavaScript files, 14 CSS stylesheets, and 0 iframes on the page. The site implements the following web standards and features: XML Sitemap (helps search engines discover all pages) and Schema.org structured data (Organization). Notable missing features: robots.txt. Adding these could improve search engine discoverability and rich result eligibility. The website has social media presence across 6 platforms: Facebook (@21stcenturyhealthcaresg), Twitter (@21stCenturyVits), Instagram (@21stcenturysg), Youtube (@UC9HJeJXi3t74vs5rS3yuotg), Tiktok (@21stcenturysg), and Pinterest (@21stCenturySg). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.

The title tag for 21stcentury.sg is well-optimized at 60 characters: "21st Century Healthcare | Shop Vitamins & Supplements Online". The length falls within the ideal range for Google search results, ensuring the full title is displayed without truncation. The meta description is 136 characters (well-optimized): "Buy vitamins, supplements, and healthcare products online in Singapore. Available vitamins for men, women, children, and...". 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 canonical url is correctly set to https://21stcentury.sg/, preventing duplicate content issues and the page language is declared as en. Open Graph meta tags are configured with 3/4 recommended fields: OG title ("21st Century Healthcare | Shop Vitamins & Supplements Online..."), OG description, OG type (website). These tags control how the page appears when shared on Facebook, LinkedIn, and other social media platforms that support the Open Graph protocol. A Twitter Card of type summary_large_image is configured, which controls how links appear when shared on Twitter/X. The "summary_large_image" type displays a large image preview, which typically generates higher engagement rates than the basic card type. The site implements Schema.org structured data with the following types: Organization. Structured data helps search engines understand the page content and can enable rich results (featured snippets, knowledge panels, star ratings) in Google search results, which can significantly increase click-through rates.