“domains and DNS”

Generates look-alike domain permutations for a domain and checks which are registered, to spot phishing.

Checks the health and configuration of a domain's DNS and mail servers.

Maps a domain's DNS records and subdomains, and renders a graph of hosts.

Queries DNS records for a domain and shows nameservers and propagation across resolvers.

Looks up DNS records for a domain with a dig-style query.

Runs a bundle of mail, DNS, web and blacklist checks on a domain and flags problems.

Queries A, AAAA, MX, TXT and other record types through Cloudflare's DNS-over-HTTPS with a choice of resolver.

Looks up and validates the SPF DNS record of a domain.

Single box that runs MX, DNS, blacklist, SPF, DMARC and other lookups for a domain or IP.

Queries Google's public resolver for a name and record type and shows the answer.

Visualizes a domain's DNSSEC chain of trust and highlights misconfigurations.

Looks up a domain's MX records and runs related DNS and mail checks.

Retrieves a domain's SPF record and checks syntax and DNS lookup limits.

Recursively walks an SPF record, counting DNS lookups and listing authorized senders.

Looks up and validates a DKIM public key record for a domain and selector.

Looks up and validates a domain's DMARC record and explains each tag.

Lists the MX records for a domain and tests the mail servers' connectivity.

Checks a domain's MX and SPF records.