IP WHOIS lookup
Who an IP address is allocated to, the range it belongs to, and the network that announces it.
Allocation
Routing
Allocation data comes from RDAP, the protocol that replaced WHOIS. Routing data comes from Team Cymru’s public DNS service. Both are queried straight from your browser.
よくある質問
What is the difference between this and a geolocation lookup?
This shows who an address is registered to and which network announces it — facts published by the regional internet registries and visible in the global routing table. A geolocation lookup guesses where the address is being used, which is a separate and much less reliable question.
Why does it show a hosting company instead of the website I looked up?
Because most sites do not own their addresses. If a site is behind Cloudflare, Fastly or any cloud host, the address belongs to that provider and the lookup correctly shows them. It is a sign of how the site is hosted, not an error.
What is an ASN?
An autonomous system number identifies a network that announces routes on the internet — an ISP, a hosting company, a large organisation. The ASN shown here is the one currently announcing the prefix that contains your address, taken from the live routing table rather than the registry.
Why is the country blank, or wrong?
Country in registry data describes where the allocation was made, not where the address is used. A block issued to a company registered in the Netherlands may be used entirely in Singapore. Many registries do not publish it at all.