Domain / WHOIS Tools
Domain checks combine registration, DNS and certificate evidence so you can understand who operates a domain, how it resolves and whether its public identity looks consistent.
Focused tools for this topic
Look up domain registration data, DNS records and SSL certificate context from one domain troubleshooting hub.
Query structured registration data for a domain, IP address or autonomous system number through authoritative RDAP registry routes.
DNS LookupLook up A, AAAA, MX, TXT, NS, CNAME and CAA records through an encrypted public DNS-over-HTTPS resolver.
SSL Certificate CheckerReview a hostname's latest public Certificate Transparency record, including identity, issuer, validity dates and remaining lifetime.
Domain Health CheckerRun a practical DNS health check covering website addresses, nameservers, mail routing, DNSSEC, CAA, SPF and DMARC.
What to know before using these checks
Domain evidence comes from multiple systems
RDAP and WHOIS describe registration data. DNS describes how the domain is delegated and resolved. Certificates describe names that have appeared in public certificate logs.
No single source is complete. Comparing them helps identify expired domains, stale DNS, privacy-redacted registration data and certificate mismatches.
Learn the concepts behind the tools
Common questions
Why is WHOIS information hidden?
Privacy rules, registry policy and registrar privacy services can redact personal contact data while still exposing operational registration fields.
Can RDAP show domain expiration?
Often yes, but field availability varies by registry. Some domains expose clear expiration events and others expose less detail.