Tools

Look up and validate a domain's DMARC policy.

Validate an SPF record and its include chain.

Break down a raw header block hop by hop.

Look up a DKIM public key by domain and selector.

See which mail servers handle a domain's email.

Look up a domain's IPv4 address.

See which nameservers are authoritative for a domain.

Check a site's TLS certificate and connection.

See if an IP is on a mail blocklist.

Look up and validate a domain's DMARC policy.

Validate an SPF record and its include chain.

Look up a DKIM public key by domain and selector.

Check a domain's brand logo indicator setup.

Verify enforced TLS for inbound mail.

Check TLS delivery failure reporting.

Break down a raw header block hop by hop.

See your own public IP address.

See which mail servers handle a domain's email.

Look up a domain's IPv4 address.

Look up a domain's IPv6 address.

See what a domain or subdomain aliases to.

See which nameservers are authoritative for a domain.

Check a domain's zone settings.

Find the host and port for a network service.

See which certificate authorities may issue for a domain.

Find the hostname behind an IP address.

Check a site's TLS certificate and connection.

See which AI crawlers are allowed or blocked.

Check for a published llms.txt file.

See if an IP is on a mail blocklist.

Find which network announces an IP.

Look up a domain's registration details.