DNS, TLS certificates, registration records, HTTP security headers, availability and URL content — all of it.
Core monitoring — DNS, WHOIS and TLS on the domain itself — is included on every domain. URL, HTTP and port checks, and checks on other hostnames, use your plan's monthly check credits.
Track all DNS record types including A, AAAA, CNAME, MX, TXT, and more. Detect hijacking attempts and configuration errors.
Monitor certificate expiry, changes, and security issues. Never let a certificate expire unexpectedly again.
Track domain ownership, registrar changes, and expiration dates. Know immediately if domain details change.
Monitor specific URLs or page sections for changes. Perfect for tracking prices, availability, or content updates.
Monitor web servers for availability and response times. Detect availability issues and unexpected changes.
Monitor TCP port availability and connectivity. Track service uptime and network accessibility.
From enterprise security to personal projects, DomainDiff has you covered
Protect against DNS hijacking, subdomain takeovers, and certificate issues. Get instant alerts on unauthorized changes.
Track competitor prices, monitor product availability, and watch for website updates that matter to your business.
Prevent downtime, track infrastructure changes, and maintain compliance with automated monitoring.
Onboard your entire customer base for centralized domain monitoring. Scale your security services efficiently.
Get started in minutes, not hours
Enter any domain names and URLs you want to track and the checks you want to perform. Our onboarding wizard can make this a breeze.
DNS, WHOIS and TLS are checked every 15 minutes, and you choose how often to check your pages, sites and ports. The core checks run on every domain, on every plan, so how closely you watch never changes what you pay.
Receive alerts by email, Slack or PagerDuty when changes are detected. Review detailed change reports in your dashboard.
Monitor DNS, SSL/TLS, WHOIS, and web content all from one platform. No need for multiple tools.
Route alerts to email, Slack or PagerDuty, with more coming soon.
Distributed monitoring ensures reliability and catches region-specific issues.
Detailed history of all changes with timestamps and before/after comparisons.
REST API for custom integrations, plus signed event webhooks that fire the moment a change is detected, so your own systems decide what happens next. Connect with your existing security and monitoring tools.
Built by application security specialists at 4ARMED. Enterprise-grade security for all users.
Priced by the domain, with core monitoring - DNS, WHOIS and TLS - included on every domain, plus a monthly allowance of check credits for everything beyond it. Simple and predictable, with a 7-day free trial.
7-day free trial • Cancel anytime