DNS lookup
Reads all DNS record types of a domain: A, AAAA, MX, NS, TXT, CNAME, SOA and CAA. Useful for migrations, debugging e-mail issues or checking IPv6 records.
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Other tools
SSL check
TLS certificate, validity, cipher.
DMARC lookup
SPF, DMARC, DKIM and MX records.
HTTP headers
HSTS, CSP, X-Frame-Options & co.
Whois / RDAP
Registrar, expiry, status, name servers.
Port scan
20 common TCP ports, critical ones flagged.
Cookie audit
Set-Cookie headers, flags, tracker detection.