Free tools
Security and network checks you can use right now, no signup required. Each one attacks a specific problem; the domain analyzer brings them all together.
Visitor snapshots
Site status
- Domain AnalyzerDNS, TLS, headers, email, ports and more — your domain's full report in a minute.
- Perimeter VPS Analyzer10-second external diagnostic for SSL certificates, DNS records, SPF, DMARC, and perimeter ports of your VPS.
- Redirect TraceFollow the full redirect chain of any URL, hop by hop.
- Is It DownCheck if a domain responds from our server right now.
Domain & DNS
Server & DevOps
- VPS Hardening GeneratorDownloadable bash script to secure a new VPS: firewall, fail2ban, hardened SSH.
- One-command VPS auditA read-only script checks SSH, firewall, exposed services and patches, and gives your server a score.
- sshd_config GeneratorHardened SSH directives with an explanation for each one.
- Fail2ban Jail GeneratorJail ready to paste into jail.local for SSH, Nginx, Postfix, or Dovecot.