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.

6 hosts · 223 ms

HostCertsFirst seenLast seen
diversa.com.au 15 2026-04-22 2026-09-27
*.diversa.com.au 15 2026-04-22 2026-09-27
arcadia.diversa.com.au 4 2026-05-16 2026-07-08
reggae.arcadia.diversa.com.au 2 2026-05-16 2026-07-07
reggae-api.arcadia.diversa.com.au 2 2026-05-16 2026-07-07
mta-sts.diversa.com.au 3 2026-06-10 2026-08-11

Programmatic access: API GET /v1/hosts/diversa.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/diversa.com.au.