Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

21 hosts · 318 ms

HostCertsFirst seenLast seenDNS
forhers.com 11 2026-04-13 2026-09-08 ok
*.forhers.com 6 2026-04-13 2026-08-06 —
marketing.forhers.com 2 2025-09-23 2026-08-24 ok
www.marketing.forhers.com 2 2025-09-23 2026-08-24 ok
internal.forhers.com 5 2026-05-08 2026-09-05 ok
*.dev-internal.forhers.com 5 2026-05-16 2026-09-13 —
tm.forhers.com 4 2026-04-25 2026-10-04 ok
app.forhers.com 2 2025-07-12 2026-06-12 ok
link.app.forhers.com 5 2026-04-27 2026-09-26 ok
www.app.forhers.com 2 2025-07-12 2026-06-12 ok
ablink.alerts.forhers.com 3 2026-06-22 2026-09-06 ok
testing.news.forhers.com 4 2026-05-18 2026-08-02 ok
ablink.news.forhers.com 3 2026-06-22 2026-09-06 ok
get.forhers.com 3 2025-10-14 2026-09-14 ok
www.get.forhers.com 3 2025-10-14 2026-09-14 ok
start.forhers.com 2 2025-07-01 2026-06-01 ok
www.start.forhers.com 2 2025-07-01 2026-06-01 ok
*.dev.forhers.com 5 2026-04-27 2026-08-25 —
www.forhers.com 14 2026-04-11 2026-08-07 ok
privacy.forhers.com 2 2025-09-19 2026-08-20 ok
www.privacy.forhers.com 2 2025-09-19 2026-08-20 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/forhers.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/forhers.com.