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Query multiple public DNS resolvers at once to see whether a record has propagated.

Check a domain's MTA-STS DNS record and try to fetch its policy file.

Check whether an IPv4 address is listed on common spam DNSBLs.

Look up and parse a domain's DKIM public key TXT record for a given selector.

Look up a domain's MX records, sorted by delivery priority.

Look up a domain's DMARC policy TXT record and flag common misconfigurations.

Look up a domain's SPF TXT record, list its mechanisms, and flag common misconfigurations.

Look up how long ago a domain was first registered.

Look up registrar, creation, and expiry data for up to 20 domains at once.

Look up when a domain's registration expires and how many days are left.

Check whether a domain name is unregistered and free to register.