yello.de

We performed a comprehensive analysis of yello.de on 2026-07-07. The website returned an HTTP 200 status code with a server response time of 13650ms. The page is served over HTTP/2 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 514 KB. The website uses a secure HTTPS connection with a valid SSL certificate issued by DigiCert Inc (OV type). The connection is encrypted using TLS 1.3 with the TLS_AES_256_GCM_SHA384 cipher suite and sha256WithRSAEncryption signature algorithm. The certificate covers 10 domain(s) (Subject Alternative Names) and expires on 2026-10-17, which is 102 days from now. The security headers analysis reveals a score of 100/100 (excellent). The following security headers are properly configured: Content-Security-Policy, Strict-Transport-Security (HSTS), X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy. All recommended security headers are in place, providing comprehensive protection against common web attacks. Our technology detection scan identified 11 technologies across 8 categories powering yello.de. The detected stack includes Nuxt.js, React, Google Analytics 4, Google Tag Manager, Meta Pixel, LinkedIn Insight Tag, Google Ads, Google AdSense, Amazon CloudFront, Google Fonts, and YouTube Embed. The site uses Nuxt.js as its primary framework. The UI is built with React. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, yello.de receives an overall trust score of 82/100, classified as "Very Likely Safe".

After conducting a thorough safety and legitimacy analysis, yello.de receives a trust score of 82/100, which places it in the "Very 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, a valid SSL certificate issued by DigiCert Inc with 102 days until expiration, SPF (Sender Policy Framework) email authentication preventing email spoofing, and DMARC email authentication with a reject policy — the strongest available setting. Areas of concern include: 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 yello.de 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.

Our technology detection engine scanned yello.de and identified 11 distinct technologies across 8 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records. Framework: Nuxt.js — provides the application framework and routing for yello.de. UI Library: React — handles the user interface rendering and component management for yello.de. Analytics: Google Analytics 4 — tracks visitor behavior and provides traffic insights for yello.de. Tag Manager: Google Tag Manager — manages marketing and analytics tags without code changes for yello.de. Advertising: Meta Pixel, LinkedIn Insight Tag, Google Ads, and Google AdSense — handles advertising pixel tracking and conversion measurement for yello.de. CDN: Amazon CloudFront — accelerates content delivery by caching assets at edge locations worldwide for yello.de. Fonts: Google Fonts — delivers web fonts for typography for yello.de. Video: YouTube Embed — provides video hosting and playback for yello.de. We also extracted the following tracking identifiers: Google Tag Manager container GTM-PRTV6M. These IDs can be used to identify other websites operated by the same organization.

yello.de delivers its homepage in 13650ms (server response time), which is considered slow by industry standards. The total page weight is 514 KB, and we detected 141 resource requests loading assets from 8 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: 0 out of 21 CSS files and 0 out of 0 JavaScript files are minified. Minifying the remaining 21 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. From an environmental perspective, each page view of yello.de produces approximately 0.25g of CO₂, earning a carbon rating of B. 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 514 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for yello.de. 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.

yello.de resolves to the IPv4 address 52.232.56.79, 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 4 name servers: nss01.enbw.com, nss02.enbw.com, nss03.enbw.com, and nss04.enbw.com. Having 4 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 yello.de is handled by Microsoft 365 with 1 MX records configured: yello-de.mail.protection.outlook.com. 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 (Domain-based Message Authentication, Reporting and Conformance) is configured with a reject policy — the strongest setting, instructing receiving servers to reject unauthorized emails entirely. 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 yello.de. 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 homepage of yello.de contains 1,165 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 6 H2 headings, 13 H3 headings, 0 H4 headings. The page includes 19 images. 1 images (5%) 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 95% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 79 internal links pointing to other pages on the same domain and 14 external links pointing to third-party websites. There are 0 external JavaScript files, 21 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), robots.txt (controls search engine crawling behavior), and Schema.org structured data (ReadAction, WebPage, and WebSite). The website has social media presence across 5 platforms: Facebook (@yello.de), Instagram (@yello_de), Linkedin (@yello-strom-gmbh), Youtube (@UC5xCSnZnmutTkpA4GYCX1UQ), and Tiktok (@yello_de). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.

The title tag for yello.de is well-optimized at 55 characters: "Yello – Strom und mehr gute Energie für zuhause | Yello". The length falls within the ideal range for Google search results, ensuring the full title is displayed without truncation. The meta description is 124 characters (well-optimized): "Dein Stromanbieter, der Energie einfach macht! Yello. Ob Ökostrom, Wärme oder smarte Tarife ✅ Faire Preise ✅ Online per ...". 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://www.yello.de/, preventing duplicate content issues, the page language is declared as en, and the meta robots directive is set to ,. Open Graph meta tags are configured with 3/4 recommended fields: OG title ("Yello – Strom und mehr gute Energie für zuhause | Yello..."), 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: ReadAction, WebPage, and WebSite. 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.