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Tool Library

Investigation Tools for Every Layer

Start with high-signal checks first, then drill into deep record diagnostics as needed.

Need an incident playbook? Read Why Are My Emails Going to Spam?.

Popular

TLS Certificate and Cipher Analysis

Analyze certificates and cipher suites for robust TLS.

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MX Records Lookup and Verification

Check MX records for correct mail routing.

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MTA-STS Policy Validator

Validate policy file, DNS, and TLS for secure transport.

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SPF Record Checker and Validator

Inspect SPF records to prevent spoofing.

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DMARC Record Lookup

Parse DMARC policies and reporting.

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DNSSEC Chain of Trust

Check the chain from child to parent to root, and see where it fails.

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What is My IP Address

Display your public IP and reverse DNS.

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Domain to IP Address Resolution

Resolve a domain to its IP addresses.

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SMTP Capability Probe

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Scan SMTP servers for TLS and features.

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All Tools

CAA Record Lookup

View allowed certificate authorities and reporting URIs.

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SRV Record Lookup

Discover service endpoints and ports.

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CNAME Record Lookup

Resolve canonical names and pivot to other records.

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Authoritative DNS Server Lookup

Find authoritative name servers for a domain.

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SOA Record Lookup

View zone authority and timers for a domain.

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BIMI Record Verification Tool

Verify BIMI records and logos for mailbox trust.

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DKIM Record Checker and Validator

Check DKIM selectors and public keys.

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DNS Configuration Validator

Audit DNS settings for consistency.

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DS Record Lookup

Retrieve Delegation Signer records with key tags and digests.

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DNSKEY Record Lookup

Inspect DNSKEY flags, algorithms, key tags, and key sizes.

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RRSIG Record Lookup

Review DNSSEC signature windows and covering record sets.

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NSEC Record Lookup

Trace NSEC next-domain links and advertised RR types.

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NSEC3PARAM Lookup

See NSEC3 hashing algorithms, iterations, and salts.

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Reverse DNS (PTR) Record Lookup

Resolve IP addresses back to hostnames.

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ASN Lookup and Information

Retrieve ASNs and organizations for IPs.

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ASN to IP Range Lookup

List IP ranges owned by an ASN.

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Domain Whois Information Lookup

Fetch registration details for domains.

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IP Address Geolocation

Map an IP address to its country.

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DNS Blacklist (DNSBL) Lookup

Check if an IP appears on DNS blacklists.

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AAAA Record Lookup

Resolve IPv6 addresses for a domain.

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