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.

15 hosts · 251 ms

HostCertsFirst seenLast seen
leaderssl.com 6 2025-10-22 2026-01-30
*.leaderssl.com 5 2025-10-22 2025-10-27
old.leaderssl.com 5 2026-04-25 2026-08-23
stage.leaderssl.com 5 2026-04-25 2026-08-23
testreissue.leaderssl.com 6 2025-08-05 2025-08-12
*.testreissue.leaderssl.com 1 2025-08-12 2025-08-12
www.testreissue.leaderssl.com 5 2025-08-05 2025-08-12
testnikolai.leaderssl.com 1 2025-08-22 2025-08-22
www.testnikolai.leaderssl.com 1 2025-08-22 2025-08-22
api.leaderssl.com 1 2026-03-10 2026-03-10
www.api.leaderssl.com 1 2026-03-10 2026-03-10
digicert.leaderssl.com 15 2026-04-25 2026-08-23
www.digicert.leaderssl.com 10 2026-04-25 2026-08-23
st.leaderssl.com 5 2026-05-14 2026-09-11
www.leaderssl.com 37 2025-09-30 2026-01-30

Programmatic access: API GET /v1/hosts/leaderssl.com (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/leaderssl.com.