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 · 277 ms

HostCertsFirst seenLast seen
mypeopleknow.com 22 2025-06-23 2026-09-03
*.mypeopleknow.com 8 2026-05-06 2026-09-03
langfuse.mypeopleknow.com 5 2026-05-20 2026-09-17
bio.mypeopleknow.com 8 2026-04-13 2026-08-11
reacher.mypeopleknow.com 5 2026-05-30 2026-09-28
www.mypeopleknow.com 10 2025-06-23 2026-08-12

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