CTScout

Domain discovery via Certificate Transparency

Search by company name to find their domains, or by domain to find the owning organization. Data comes from public CT logs — passive, non-intrusive, updated weekly.

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How it works

1. A certstream pipeline ingests ~2.5M certificate events per week
2. OV/EV certificates carry the issuing organization's name
3. We extract apex domains, deduplicate, and aggregate by org
4. … org-domain pairs across … organizations, searchable via API

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API

# Search by company name
curl -X POST https://ctscout.dev/scan \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_KEY" \
  -d '{"company_name": "Goldman Sachs"}'

# Search by domain
curl ... -d '{"seed_domain": ["gs.com"]}'

# Both (OR logic)
curl ... -d '{"company_name": "Goldman Sachs", "seed_domain": ["gs.com"]}'

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Tiers

	Free	Pro
Queries	10 / day	Unlimited
Results	Top 5	All
Data	Weekly snapshot	Live (DNS, RDAP, crt.sh)
Price	$0	Coming soon

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