What a WHOIS lookup shows you
A WHOIS lookup returns the public registration record for a domain: whether it is registered, which registrar manages it, what registration dates are recorded, and what public status information is available.
Where RDAP fits
RDAP answers the same questions in a structured format with predictable field names and standard error responses, and is the modern standard for registration-data access. The service that answers depends on the extension, so a registration lookup resolves the appropriate RDAP service for the domain being queried and uses WHOIS data only where it remains supported.
Why some fields are missing
Registries publish different fields, and many registrars redact contact details or substitute a privacy service. A sparse record is normal and does not mean the domain is unregistered — check the status codes and dates rather than the contact block. To see where the name currently points, run a DNS lookup; to check whether a different name is free, use the domain checker.
DomainsMesh is an independent tool and not a registrar. Registration information comes from public WHOIS and RDAP sources where available.