DNS checker
See how a domain is set up in DNS and when its domain name runs out.
What the result shows
How it resolves
The aliases (CNAME) the name passes through, and the addresses it ends at.
Nameservers
Who answers DNS for the domain, so where its records are changed; the DNS host is named when we recognise it, with DNSSEC on or off.
CAA records
Which certificate authorities may issue certificates for the name. No CAA records means any of them may.
Registration
When the domain name runs out, the registrar, since when it is registered, and whether it is locked against transfers.
It only asks DNS and the domain registry's public lookup (RDAP); it doesn't connect to the domain's servers, and stores nothing. Some endings (such as .de, .io or .eu) don't publish registration dates there.