Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

3 hosts · 243 ms

HostCertsFirst seenLast seen
spotify.com.au 9 2026-05-19 2026-09-15
image.email.spotify.com.au 3 2025-07-23 2026-07-26
www.spotify.com.au 5 2026-05-20 2026-09-21

Programmatic access: API GET /v1/hosts/spotify.com.au (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/spotify.com.au.