Subdomain Lookup

Discovering a subdomain is usually the first step, not the last. Once a scan turns up hosts you had forgotten — old staging or mail names are common — it is worth checking each one for delegation, glue and MX record problems that can quietly break resolution or email. If a name you found has recently changed hands or been repointed, you can also confirm how those records have propagated across public resolvers to be sure the update is live everywhere.