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 · 269 ms

HostCertsFirst seenLast seenDNS
gruber-dme.com 31 2026-05-12 2026-08-28 ok
*.gruber-dme.com 4 2026-06-21 2026-08-20 —
bimi.gruber-dme.com 6 2026-06-30 2026-08-28 ok
*.bimi.gruber-dme.com 6 2026-06-30 2026-08-28 —
mediacontrol.gruber-dme.com 2 2026-08-18 2026-08-18 ok
mta-sts.gruber-dme.com 6 2026-06-21 2026-08-19 ok
*.mta-sts.gruber-dme.com 6 2026-06-21 2026-08-19 —
skw.gruber-dme.com 3 2026-06-09 2026-06-09 nxdomain
www.gruber-dme.com 13 2026-05-07 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/gruber-dme.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/gruber-dme.com.