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.

7 hosts · 201 ms

HostCertsFirst seenLast seen
coldest.com 32 2026-04-21 2026-10-08
*.coldest.com 16 2026-04-21 2026-10-06
wholesale.coldest.com 13 2026-05-30 2026-10-10
team.coldest.com 2 2026-07-28 2026-07-28
app.coldest.com 4 2026-06-14 2026-10-12
account.coldest.com 17 2026-05-21 2026-09-20
www.coldest.com 15 2026-05-30 2026-10-10

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