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Subdomain Finder - Discover Subdomains via CT Logs
Developer toolsSEO tools

Subdomain Finder - Discover Subdomains via CT Logs

Discover every subdomain of any domain using Certificate Transparency logs (crt.sh). Fast bulk subdomain enumeration for security recon, attack-surface mapping, asset discovery and SEO. No API key — export to CSV or JSON.

Open on Apify ↗ Read the guide
Pricing
Pay per event

Charged only on successful results.

Output
JSON / CSV

Clean schema, ready for ETL.

Runtime
177 runs

9 users total

Infra
Hosted

No setup — runs in the cloud on Apify.

What it returns

Discover every subdomain of any domain using Certificate Transparency logs (crt.sh).

How to run it

  1. Open the actor on Apify (button above).
  2. Fill the input schema — most fields have sensible defaults.
  3. Click Run. Results land in the dataset within minutes.
  4. Export as JSON or CSV, or pull via the dataset API.

Guides for this scraper

data

How to Find All Subdomains of a Domain via CT Logs in 2026

Enumerate every subdomain of any domain passively from Certificate Transparency logs — bulk, no API key, with first/last-seen dates and live-host filtering.

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