CRT Name

Find subdomains indexed by crt.name and see when each hostname first appeared.

crt.name is a free subdomain index built from certificate transparency logs and related datasets. No API key is required.

Search Apex

1. Run Search Apex.
2. Enter an apex domain such as example.com (URLs are accepted too).
3. Filter the list, then open a hostname or copy it.

Each result shows the date it first appeared in the crt.name index, or Unknown when that date is missing.

Use Refresh Results to bypass the local cache and fetch again.

AI

Ask Raycast AI to search subdomains for an apex domain. You can filter by hostname text, sort by first-seen date or alphabetically, and limit how many names are returned.

The tool is read-only. It does not probe DNS or check whether a host is reachable.

Notes

• Results are passive index records. A listed hostname may not currently resolve, and listing does not prove current ownership.
• Dates are first-seen in the index, not certificate metadata.
• crt.name allows 1,000 free requests per IP per day.