WHOIS Lookup: tracing the ownership trail of domains and IPs
WHOIS is like the internet public ledger. Every registered domain leaves a trail: when it was registered, through which registrar, when it expires, and which nameservers it uses. This data used to be wide open, including the owner name and email. The story is a little different now.
Since privacy rules like GDPR came into force, a lot of personal data is hidden. So do not be surprised if the contact section shows up as redacted. Even so, the remaining information is very useful, especially when buying a used domain, verifying a site is genuine, or simply making sure your own domain gets renewed on time.
Why we use RDAP
This tool does not rely on the legacy WHOIS with its messy, registry-specific format. We use RDAP, the official successor, which returns data in a clean and consistent shape. The result is easier to read and far more reliable to access from anywhere because it runs over HTTPS. For those who often hit a wall when WHOIS port 43 queries are blocked by hosting, RDAP is a lifesaver.
What you can dig out of WHOIS
- Expiry date — the most checked field. Even a day late can take your domain offline and tank your traffic.
- Registrar — knowing where the domain is managed helps when transferring or troubleshooting.
- Domain status — codes like clientTransferProhibited indicate a security lock that prevents unauthorized transfers.
- Nameservers — confirm the domain points to the correct DNS provider.
Not just domains, IPs too
Enter an IP address and this tool traces it to the Regional Internet Registry that manages it. For Indonesia and the Asia Pacific, the data comes from APNIC. You will see the organization that owns the IP block, its address range, and the allocation country. This is handy when investigating which network a suspicious bit of traffic comes from.