aircourse.com

We performed a comprehensive analysis of aircourse.com on 2026-06-30. The website returned an HTTP 200 status code with a server response time of 9060ms. 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 GlobalSign nv-sa (OV type). The connection is encrypted using TLS 1.2 with the ECDHE-RSA-AES128-GCM-SHA256 cipher suite and sha256WithRSAEncryption signature algorithm. The certificate covers 2 domain(s) (Subject Alternative Names) and expires on 2026-09-26, which is 88 days from now. The security headers analysis reveals a score of 15/100 (poor). The following security headers are properly configured: X-Frame-Options. However, the site is missing Content-Security-Policy, Strict-Transport-Security (HSTS), 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 5 technologies across 5 categories powering aircourse.com. The detected stack includes Webpack, Google Tag Manager, New Relic, jQuery, and Font Awesome. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, aircourse.com receives an overall trust score of 66/100, classified as "Likely Safe".

After conducting a thorough safety and legitimacy analysis, aircourse.com receives a trust score of 66/100, 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, a valid SSL certificate issued by GlobalSign nv-sa with 88 days until expiration, SPF (Sender Policy Framework) email authentication preventing email spoofing, DMARC email authentication with a none policy, and a well-established domain registered for over 14.7 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, 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 aircourse.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 NameBrew LLC based in JP, with a registration date of 2011-10-10 and expiration date of 2026-10-10.

Our technology detection engine scanned aircourse.com and identified 5 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. Build Tool: Webpack — bundles and optimizes the JavaScript and CSS assets for aircourse.com. Tag Manager: Google Tag Manager — manages marketing and analytics tags without code changes for aircourse.com. Monitoring: New Relic — monitors application performance and errors for aircourse.com. JavaScript Library: jQuery — provides utility functions and DOM manipulation for aircourse.com. Icon Set: Font Awesome — provides additional functionality for aircourse.com. We also extracted the following tracking identifiers: Google Tag Manager container GTM-T9RDLWS. These IDs can be used to identify other websites operated by the same organization.

aircourse.com delivers its homepage in 9060ms (server response time), which is considered slow by industry standards. The total page weight is 171 KB, and we detected 195 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 8 CSS files and 3 out of 7 JavaScript files are minified. Minifying the remaining 12 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 aircourse.com 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 aircourse.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.

aircourse.com resolves to the IPv4 address 16.76.10.97, 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-130.awsdns-16.com, ns-1489.awsdns-58.org, ns-1786.awsdns-31.co.uk, and ns-754.awsdns-30.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 aircourse.com is handled by heteml.jp with 2 MX records configured: mx-proxy501.heteml.jp and mx-proxy502.heteml.jp. 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 none policy — a monitoring-only setting that doesn't enforce any action on unauthorized emails. 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 aircourse.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 NameBrew LLC (JP). It was first registered on 2011-10-10 and is set to expire on 2026-10-10, making it 14.7 years old. Our subdomain enumeration scan discovered 2 active subdomains for aircourse.com: api.aircourse.com and www.aircourse.com. Active subdomains can reveal the organization's infrastructure, including development environments, API endpoints, and third-party service integrations.

The homepage of aircourse.com contains 299 words of visible text content. This is a relatively short page — adding more descriptive content could improve search engine visibility. The page is structured with 9 H2 headings, 27 H3 headings, 0 H4 headings. The page includes 52 images. 18 images (35%) 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 65% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 110 internal links pointing to other pages on the same domain and 13 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 7 external JavaScript files, 8 CSS stylesheets, and 2 iframes on the page. The site implements the following web standards and features: robots.txt (controls search engine crawling behavior). Notable missing features: XML Sitemap and Schema.org structured data. Adding these could improve search engine discoverability and rich result eligibility. The website has social media presence across 1 platforms: Github (@newrelic). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.

The title tag for aircourse.com is well-optimized at 34 characters: "AirCourse - 社員教育をカンタンに。クラウド型eラーニング". The length falls within the ideal range for Google search results, ensuring the full title is displayed without truncation. The meta description is 143 characters (well-optimized): "クラウド型eラーニング「AirCourse」なら、初期費用0円、1ユーザー/月額200円～の定額制で1,300コース8,000本以上の研修動画が受け放題。自社オリジナルのeラーニングコースも誰でも簡単に作成・配信。集合研修・オンライン研修管...". 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://aircourse.com/, preventing duplicate content issues, the page language is declared as ja, and a favicon is configured. Open Graph meta tags are configured with 4/4 recommended fields: OG title ("AirCourse - 社員教育をカンタンに。クラウド型eラーニング..."), 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 meta keywords tag contains 5 terms including 社員教育, eラーニング, LMS, 自社研修, and 人材育成. 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.