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.

11 hosts · 188 ms

HostCertsFirst seenLast seen
farel.io 14 2026-01-09 2026-08-24
*.farel.io 2 2026-05-14 2026-05-14
sandbox-b2b.farel.io 5 2026-06-02 2026-09-23
sandbox-ibe.farel.io 3 2026-05-22 2026-09-09
trail.farel.io 5 2026-04-24 2026-08-23
traill.farel.io 9 2026-06-03 2026-10-01
crm.farel.io 3 2026-08-05 2026-09-29
docs.farel.io 2 2026-07-02 2026-08-26
mta-sts.farel.io 2 2026-06-09 2026-06-09
www.farel.io 11 2026-04-28 2026-08-21
sandbox.farel.io 3 2026-05-19 2026-09-03

Programmatic access: API GET /v1/hosts/farel.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/farel.io.