Subdomain scanner
Collects your subdomains from several passive sources (Certificate Transparency, passive DNS, web archive, home page), probes common names via DNS and lists them in one table: what each resolves to, which source found it, dangling records and takeover signals. No sign-up, up to 300 names.
Other tests
Security headers test
Grades HSTS, CSP depth, CORS, SRI, mixed content and cookie settings.
SSL/TLS check
Certificate chain, protocols, weak ciphers.
Email security check
SPF, DKIM and DMARC: can someone send fake email in your name?
Attack surface reconnaissance
Passive OSINT: subdomains, dangling records, technology stack, DNS and ASN; what an attacker sees during recon.
DNS and domain security check
DNSSEC, CAA, name servers and the domain registration: lock, expiry date.