Domain Lookup finds hostnames, email addresses, IP addresses, and URLs that already appear in public internet records for a domain, such as certificate logs and web indexes. Use it to inventory the public footprint of domains you manage.
How it works
Enter a domain and choose a lookup range (Quick, Standard, Emails, or Broad).
The server checks public records such as certificate logs and web indexes.
Results are grouped into hostnames, emails, IP addresses, and URLs you can copy.
Only public listings are queried. Use this on domains you manage.
Why it matters
See which hostnames are already listed in public certificate records.
Find email addresses that appear in public web listings for your domain.
Cross-check archived pages and public indexes for forgotten hostnames.
Keep an inventory of public records that search engines and certificate logs already publish.
FAQ
What does this tool look up?
It collects hostnames, emails, IP addresses, and URLs that are already published in public records for the domain you enter, such as certificate logs and web indexes.
Why are some records missing?
Only public listings are queried. Paid or private data sources are not used, so the list is not exhaustive.
Why did a lookup time out?
Broad lookups check more public indexes and can exceed the time limit. Try Quick or Standard, or retry later if the server is busy.
Open the interactive tool on this page after JavaScript loads, or contact us if something is broken.