Question 1

What can I look up?

Accepted Answer

Domains, public IPv4, IPv6 and AS numbers (such as AS15169) are supported. Enter a domain name without https://, a port or path. Examples: qq.com, 1.1.1.1 and AS15169. Subdomains such as www.qq.com may not have independent registration records; normally enter the registered domain, qq.com.

Question 2

What is the difference between WHOIS and RDAP?

Accepted Answer

Both retrieve registration information. This page uses structured RDAP data: registries supply domain records and regional internet registries supply IP and ASN records. The page displays identifiers, status, name servers, event dates and entities when returned. Available fields differ across registries. Use the raw RDAP view to inspect the full response.

Question 3

Why did the lookup fail or return nothing?

Accepted Answer

The domain suffix may not have an available RDAP service, the domain may be unregistered, or upstream rate limits or timeouts may apply. A failed lookup does not mean the domain is available; check with a registrar. Verify spelling and format, then retry. If only one suffix fails, its registry service may be unsupported or temporarily unavailable. Do not repeatedly click to bypass upstream rate limits.

Question 4

Why is registrant or country information missing?

Accepted Answer

The source may omit these fields or redact contact details. “Unknown” only means the response did not provide data. A country in a domain record usually refers to registration or contact information, not the server location. Contact handles are not necessarily names; privacy proxies or registrar entities may appear instead of the registrant.

Question 5

What do domain status and name servers mean?

Accepted Answer

“transfer prohibited” restricts transfers, “delete prohibited” restricts deletion, and “hold” suspends resolution. Name servers are the authoritative servers listed in registration data, not the website's current server IP. “client” usually indicates registrar restrictions and “server” registry restrictions. A transfer lock does not make a website inaccessible, and these name servers are not necessarily your current recursive DNS servers.

Question 6

Do recent lookups update automatically?

Accepted Answer

This browser keeps the last 10 successful IP and WHOIS lookups separately. Selecting history shows saved results and timestamps; click “Look up” for fresh data. Clearing site data removes local history. A successful repeat lookup replaces the old result and moves it to the top. Entries beyond 10 are removed oldest first. The cache does not refresh in the background; look up again when registration, DNS or expiry details may have changed.

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WHOIS / RDAP lookup for domains, IPs and ASNs

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