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Subdomain Finder

GET /v1/domain/subdomains2 credits / requestcache 1440 min

Finds a domain's subdomains from public Certificate Transparency logs (crt.sh, with Cert Spotter as a fallback), with first and last seen dates and how many certificates named each host, newest first. CT logs list every name that ever had a public TLS certificate, not the current DNS, so some results may no longer resolve.

Query parameters

domain
string · required
Registrable domain, e.g. example.com (URLs and subdomains are reduced to it).
limit
integer
Maximum subdomains to return (most recently seen first).
Default: 500
max_age
integer
Accept a cached answer up to this many seconds old, billed at 50%.

Response data fields

    Example

    curl "https://api.gridlode.com/v1/domain/subdomains?domain=python.org&limit=100" \
  -H "Authorization: Bearer $GRIDLODE_KEY"

    Try it without code on the Subdomain Finder API page.