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.

8 hosts · 231 ms

HostCertsFirst seenLast seen
thordata.com 21 2026-01-26 2026-10-01
*.thordata.com 19 2026-03-04 2026-10-01
data.thordata.com 2 2026-02-03 2026-02-03
doc.thordata.com 6 2026-05-06 2026-09-01
uptime.thordata.com 2 2026-06-01 2026-06-01
affiliate.thordata.com 10 2026-05-15 2026-09-11
mail.thordata.com 1 2025-11-17 2025-11-17
dca-datasets.thordata.com 2 2026-01-26 2026-01-26

Programmatic access: API GET /v1/hosts/thordata.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/thordata.com.