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.

11 hosts · 354 ms

HostCertsFirst seenLast seenDNS
fitonapp.com 4 2025-10-23 2026-05-08 ok
*.fitonapp.com 6 2025-09-21 2026-08-21 —
static.fitonapp.com 2 2026-04-08 2026-09-08 ok
noom-static.fitonapp.com 2 2026-03-04 2026-07-20 ok
admin.fitonapp.com 1 2025-11-24 2025-11-24 ok
help.fitonapp.com 14 2026-05-07 2026-09-03 ok
shop.fitonapp.com 14 2026-05-20 2026-07-31 ok
*.messages.fitonapp.com 3 2025-09-27 2026-08-27 —
returns.fitonapp.com 4 2026-05-15 2026-07-13 ok
*.newsletters.fitonapp.com 3 2025-09-26 2026-08-26 —
www.fitonapp.com 2 2025-11-08 2026-05-08 ok

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