Find subdomains of any domain

List subdomains seen in public Certificate Transparency logs, with first and last certificate dates.

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Need this at scale?

The same lookup is one API call at 2 credits / request (one credit is $0.0003 to $0.001 depending on volume), with failed requests free.

cURL

curl "https://api.gridlode.com/v1/domain/subdomains?domain=python.org" \
  -H "Authorization: Bearer $GRIDLODE_KEY"

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FAQ

Are all of these subdomains live?

Not necessarily. Certificate Transparency shows every name that ever had a public certificate. Use the DNS lookup to check whether a subdomain still resolves.