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.

16 hosts · 328 ms

HostCertsFirst seenLast seen
going.com 38 2025-09-15 2026-09-15
*.going.com 20 2025-09-15 2026-09-15
static.going.com 12 2026-04-21 2026-08-17
e.going.com 11 2026-05-21 2026-09-17
explore.going.com 3 2026-09-14 2026-09-14
auth.going.com 30 2026-04-22 2026-08-28
api.going.com 21 2026-05-29 2026-10-09
gtm.going.com 3 2026-05-01 2026-08-19
help.going.com 9 2025-09-24 2026-09-29
app.going.com 14 2026-05-03 2026-08-29
clicks.going.com 12 2026-04-21 2026-08-17
teams.going.com 14 2026-04-22 2026-08-18
assets.going.com 14 2026-04-20 2026-08-16
get.going.com 16 2026-05-21 2026-09-17
www.going.com 21 2026-04-22 2026-08-25
quiz.going.com 7 2026-05-24 2026-08-21

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