Live Domain Health for the Web's Top Sites
Continuous SSL, DNS, email authentication, security header, and expiry monitoring for 50 of the most popular domains on the internet. Updated every 1–6 hours. No signup required.
Google — world's most visited search engine and internet backbone
Microsoft — global software and cloud services leader
Facebook — Meta's flagship social networking platform
Cloudflare — global CDN, DDoS protection, and DNS infrastructure
Apple — world's most valuable tech company
YouTube — Google's video streaming platform, 2B monthly users
Amazon AWS — cloud computing infrastructure powering the internet
Instagram — Meta's photo and video sharing social platform
Microsoft Office — productivity suite used by 1.2 billion people
Twitter (now X) — real-time social media and news platform
Microsoft Live — consumer email and account services
LinkedIn — world's largest professional networking platform
Amazon — world's largest e-commerce and cloud computing company
Microsoft 365 — cloud-based identity and access management
Microsoft Azure — enterprise cloud computing platform
Wikipedia — world's largest free online encyclopedia
GitHub — world's largest software development platform
Bing — Microsoft's AI-powered search engine
Netflix — global streaming entertainment service
DigiCert — world's leading SSL/TLS certificate authority
Fastly — edge cloud platform and CDN used by major websites
WordPress.org — open-source CMS powering 43% of all websites
Pinterest — visual discovery and idea-sharing platform
iCloud — Apple's cloud storage and computing service
SharePoint — Microsoft's enterprise collaboration platform
Yahoo — media and technology company with 1B+ monthly users
WhatsApp — Meta's end-to-end encrypted messaging platform
Skype — Microsoft's video and voice calling service
X (formerly Twitter) — real-time social networking platform
MSN — Microsoft's news and information portal
Spotify — world's largest music streaming platform
TikTok — ByteDance's short-form video social platform
Vimeo — professional video hosting and streaming platform
Adobe — creative and digital document software company
Roblox — online game platform with 60M daily active users
Cloudflare Network — core DNS and routing infrastructure
QQ — Tencent's instant messaging platform with 550M+ users
Zoom — video conferencing platform with 300M+ daily users
NGINX — open-source web server powering 34% of websites
Opera — web browser with built-in VPN and AI assistant
Samsung — world's largest smartphone and electronics manufacturer
Bitly — URL shortening and link management platform
Baidu — China's dominant search engine and AI company
NGINX — commercial support and products for the NGINX web server
WordPress.com — managed WordPress hosting by Automattic
Sentry — application monitoring and error tracking platform
Mozilla — non-profit behind Firefox browser and web standards
Reddit — social news aggregation and discussion platform
Intuit — financial software company behind TurboTax and QuickBooks
VKontakte — Russia's largest social network with 75M users
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About This Domain Monitoring Dataset
DomainScan continuously monitors the top websites from the Tranco popularity list — a research-grade domain ranking that aggregates signals from Umbrella, Majestic, Quantcast, Chrome User Experience Report, and other sources. Each domain is probed across five security and operational dimensions: SSL certificate health, DNS record integrity, domain expiry status, email authentication configuration (SPF, DMARC, DKIM), and HTTP security header grades.
These pages are designed as a public resource for security researchers, domain administrators, and anyone curious about the operational health of the internet's most important infrastructure. They are updated continuously — DNS records hourly, SSL and email auth every 6 hours, domain expiry and security headers on longer cadences.
Click any domain card to see its full health dashboard, sub-scores, recent change events, and run a live on-demand scan. All data is available for free with no signup required.