Extract Domains Now
Step 1 β Choose input method
π‘ Quick load a sample to see how it works:
π
Click to upload or drag & drop
TXT Β· CSV Β· HTML Β· JSON Β· XML Β· LOG Β· MD (Max 20MB)
Step 2 β Configure extraction
Step 3 β Extract
Subdomain ExtractorKeep the full hostname hierarchy for attack-surface mapping, subdomain enumeration, or CDN inventory. The opposite of root-only mode.
What This Tool Does π Extract now
Unlike the Root Domain Extractor (which strips subdomains), this tool preserves the full hostname β so api.v2.example.com stays as-is rather than being reduced to example.com. Ideal when you care about which specific host was referenced.
How to Extract Subdomains π Extract now
- Paste your text or URLs above (or upload a file).
- Check Keep subdomains in the Domain Mode option card.
- Leave Registrable only unchecked.
- Click π Start Calculate.
Before & After Examples π Extract now
| Input | With subdomains kept | Root only |
|---|---|---|
api.example.com/v2/users | api.example.com | example.com |
blog.example.com/post | blog.example.com | example.com |
staging.api.v3.example.com | staging.api.v3.example.com | example.com |
www.example.co.uk | www.example.co.uk | example.co.uk |
Common Use Cases π Extract now
π Attack Surface Mapping
Extract every subdomain referenced in HTML/JS to catalog exposed hosts.
π SEO Subdomain Audit
Identify all blog/shop/help subdomains referenced by your site.
π CDN Inventory
Enumerate every cdn., static., media. host in use.
π οΈ Infrastructure Discovery
Map api., staging., dev. hosts referenced across configs.
Related Tools π Extract now
FAQ π Extract now
Can I extract only third-level subdomains?
Yes. Use the Domain Level filter and select "Third Level" to keep only
a.b.example.com-style hosts.Does it detect wildcards like
*.example.com?Wildcards are stripped and not counted as valid hostnames. Only concrete hostnames appear in output.