WHOIS / RDAP
See the registration record for a domain, IP range or autonomous system.
Examples:example.nl8.8.8.8AS1103
What this record does not say
An IP registration names whoever operates the range — a provider, a hosting company, an institution. It says nothing about who is using the address right now. Personal details of private registrants are redacted by European registries; that is not a gap in the data, it is the GDPR doing its job.