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.

9 hosts · 325 ms

HostCertsFirst seenLast seenDNS
gratsi.com 11 2026-05-18 2026-09-26 ok
i.gratsi.com 3 2026-05-23 2026-09-10 ok
dvmhm.gratsi.com 12 2026-05-09 2026-09-05 ok
help.gratsi.com 6 2026-05-16 2026-09-11 ok
ambassadors.gratsi.com 5 2026-05-06 2026-09-08 ok
account.gratsi.com 15 2026-04-28 2026-09-07 ok
www.gratsi.com 15 2026-05-16 2026-09-26 ok
pay.gratsi.com 1 2026-05-20 2026-05-20 ok
www.pay.gratsi.com 1 2026-05-20 2026-05-20 nxdomain

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