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.

24 hosts · 364 ms

HostCertsFirst seenLast seenDNS
guthmann.estate 69 2026-04-12 2026-09-21 ok
*.guthmann.estate 16 2026-04-12 2026-08-18 —
stage.guthmann.estate 6 2026-04-28 2026-06-26 nxdomain
release.guthmann.estate 2 2026-07-24 2026-07-24 nxdomain
*.release.guthmann.estate 2 2026-07-24 2026-07-24 —
api.guthmann.estate 8 2026-05-15 2026-09-10 ok
email.mail.guthmann.estate 4 2026-04-20 2026-08-18 ok
cdn.guthmann.estate 8 2026-04-18 2026-08-14 ok
go.guthmann.estate 2 2026-07-05 2026-07-05 nxdomain
*.go.guthmann.estate 2 2026-07-05 2026-07-05 —
mcp.guthmann.estate 2 2026-08-31 2026-08-31 —
*.mcp.guthmann.estate 2 2026-08-31 2026-08-31 —
app.guthmann.estate 6 2026-05-15 2026-09-10 ok
mailings.guthmann.estate 6 2026-07-15 2026-09-12 ok
*.mailings.guthmann.estate 6 2026-07-15 2026-09-12 —
email.mailings.guthmann.estate 1 2026-09-16 2026-09-16 ok
app-test.guthmann.estate 2 2026-06-23 2026-06-23 nxdomain
*.app-test.guthmann.estate 2 2026-06-23 2026-06-23 —
next.guthmann.estate 2 2026-07-24 2026-07-24 nxdomain
*.next.guthmann.estate 2 2026-07-24 2026-07-24 —
preview.guthmann.estate 12 2026-04-28 2026-09-21 ok
*.preview.guthmann.estate 6 2026-07-24 2026-09-21 —
www.guthmann.estate 4 2026-07-05 2026-09-02 ok
*.www.guthmann.estate 4 2026-07-05 2026-09-02 —

Programmatic access, with DNS A records: API GET /v1/hosts/guthmann.estate (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/guthmann.estate.