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 · 260 ms

HostCertsFirst seenLast seen
caide.io 12 2026-05-06 2026-09-01
*.caide.io 4 2026-05-18 2026-08-18
app-acc.caide.io 10 2026-05-09 2026-09-04
wss-acc.caide.io 8 2026-05-09 2026-09-05
mail.team.caide.io 5 2026-04-14 2026-09-26
app.caide.io 6 2026-05-11 2026-09-06
wss.caide.io 10 2026-05-11 2026-09-06
www.caide.io 8 2026-05-06 2026-09-01

Programmatic access: API GET /v1/hosts/caide.io (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/caide.io.