Where does the expiry date come from?

From the public registration data (RDAP), when the registry publishes it. Some registries hide the date.

Does a green propagation line mean every resolver agrees?

No. It compares two public resolvers only.

Can this look up a private hostname?

No. Local and private names are rejected.

Tools · Mail, DNS and sites

DNS and domain lookup

Enter a public domain. We read the DNS records and nameservers, then the registrar and expiry from the public registration data. The propagation line compares two public resolvers. It is a hint, not a check of every resolver.

Public DNS and registration data only. Nothing you type is stored. The propagation line compares two resolvers and is a hint, not a full check.

How to use it

Enter a domain such as example.co.za. A URL is accepted and reduced to the hostname.
Compare the nameservers with the company that should be hosting the DNS.
If the two resolvers disagree, wait and check again before changing records.

Questions

Where does the expiry date come from?: From the public registration data (RDAP), when the registry publishes it. Some registries hide the date.
Does a green propagation line mean every resolver agrees?: No. It compares two public resolvers only.
Can this look up a private hostname?: No. Local and private names are rejected.

An automated client can POST JSON to /api/tools/dns-lookup with domain. The OpenAPI document is at /api/tools, with a short guide at /llms.txt. Nothing submitted is stored.