oldenbourg.de

We performed a comprehensive analysis of oldenbourg.de on 2026-07-03. The website returned an HTTP 200 status code with a server response time of 31623ms. The page is served over HTTP/2 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 171 KB. The website uses a secure HTTPS connection with a valid SSL certificate issued by Amazon (DV type). The connection is encrypted using TLS 1.3 with the TLS_AES_128_GCM_SHA256 cipher suite and sha256WithRSAEncryption signature algorithm. The certificate covers 2 domain(s) (Subject Alternative Names) and expires on 2026-09-05, which is 64 days from now. 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-Content-Type-Options, and Referrer-Policy. However, the site is missing X-Frame-Options 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 6 technologies across 5 categories powering oldenbourg.de. The detected stack includes Microsoft Clarity, Google Tag Manager, Meta Pixel, Google Ads, Google Fonts, and YouTube Embed. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, oldenbourg.de receives an overall trust score of 80/100, classified as "Very Likely Safe".

After conducting a thorough safety and legitimacy analysis, oldenbourg.de receives a trust score of 80/100, 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 Amazon with 64 days until expiration, SPF (Sender Policy Framework) email authentication preventing email spoofing, and DMARC email authentication with a quarantine policy. Areas of concern include: no X-Frame-Options header, which could allow the site to be embedded in malicious iframes (clickjacking), 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 oldenbourg.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 oldenbourg.de and identified 6 distinct technologies across 5 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records. Analytics: Microsoft Clarity — tracks visitor behavior and provides traffic insights for oldenbourg.de. Tag Manager: Google Tag Manager — manages marketing and analytics tags without code changes for oldenbourg.de. Advertising: Meta Pixel and Google Ads — handles advertising pixel tracking and conversion measurement for oldenbourg.de. Fonts: Google Fonts — delivers web fonts for typography for oldenbourg.de. Video: YouTube Embed — provides video hosting and playback for oldenbourg.de. We also extracted the following tracking identifiers: Google Tag Manager container GTM-K49K738. These IDs can be used to identify other websites operated by the same organization.

oldenbourg.de delivers its homepage in 31623ms (server response time), which is considered slow by industry standards. The total page weight is 171 KB, and we detected 279 resource requests loading assets from 13 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 1 CSS files and 1 out of 10 JavaScript files are minified. Minifying the remaining 10 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 oldenbourg.de produces approximately 0.08g 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 171 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for oldenbourg.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.

oldenbourg.de resolves to the IPv4 address 63.182.222.134, 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 3 A record(s) configured. The domain name system is managed by 4 name servers: ns-1206.awsdns-22.org, ns-1586.awsdns-06.co.uk, ns-59.awsdns-07.com, and ns-876.awsdns-45.net. 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 oldenbourg.de is handled by Microsoft 365 with 1 MX records configured: oldenbourg-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 quarantine policy — a moderate setting, directing unauthorized emails to spam/junk folders. 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 oldenbourg.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 oldenbourg.de contains 702 words of visible text content. This is a moderate amount of content. The page is structured with 4 H2 headings, 10 H3 headings, 0 H4 headings. The page includes 10 images. 2 images (20%) 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 80% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 225 internal links pointing to other pages on the same domain and 11 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 10 external JavaScript files, 1 CSS stylesheets, and 0 iframes on the page. The site implements the following web standards and features: Schema.org structured data (BreadcrumbList, ContactPoint, ImageObject, ListItem, Organization, and PostalAddress) and Progressive Web App (PWA) manifest (enabling app-like installation). Notable missing features: XML Sitemap and robots.txt. Adding these could improve search engine discoverability and rich result eligibility. We detected the following payment methods accepted on oldenbourg.de: Visa and Mastercard. Offering multiple payment options including credit cards and digital wallets improves customer trust and can increase conversion rates. The website has social media presence across 3 platforms: Facebook (@cornelsenverlag), Instagram (@cornelsenverlag), and Linkedin (@cornelsen). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.

The title tag for oldenbourg.de is well-optimized at 47 characters: "Der Oldenbourg Verlag bei Cornelsen | Cornelsen". The length falls within the ideal range for Google search results, ensuring the full title is displayed without truncation. The meta description is 146 characters (well-optimized): "Schulbücher vom Oldenbourg Verlag ➤ Lehrmaterialien, Kopiervorlagen und mehr ✔ Grundschule, Mittlere Schulformen und Gym...". 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.cornelsen.de/empfehlungen/oldenbourg, preventing duplicate content issues, the page language is declared as de, the meta robots directive is set to index,follow, and a favicon is configured. Open Graph meta tags are configured with 4/4 recommended fields: OG title ("Willkommen im Oldenbourg Schulbuchverlag..."), OG description, OG image (social sharing thumbnail), 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. The site implements Schema.org structured data with the following types: BreadcrumbList, ContactPoint, ImageObject, ListItem, Organization, and PostalAddress. 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.