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.

15 hosts · 481 ms

HostCertsFirst seenLast seenDNS
matroid.com 10 2026-04-19 2026-09-25 ok
*.matroid.com 1 2026-09-25 2026-09-25 —
static.bridge.matroid.com 5 2026-05-27 2026-09-24 ok
hs.bridge.matroid.com 12 2026-05-12 2026-09-11 ok
status.bridge.matroid.com 5 2026-04-27 2026-08-25 ok
ws.bridge.matroid.com 5 2026-05-27 2026-09-24 ok
info.matroid.com 8 2026-05-17 2026-09-12 ok
app.matroid.com 5 2026-04-24 2026-08-22 ok
staging.app.matroid.com 5 2026-06-04 2026-08-07 ok
redaction.app.matroid.com 1 2026-10-02 2026-10-02 ok
redact.app.matroid.com 3 2026-06-07 2026-09-03 ok
mta-sts.matroid.com 1 2026-01-21 2026-01-21 ok
mss.dev.matroid.com 5 2026-04-18 2026-08-28 ok
mss-new.dev.matroid.com 1 2026-08-28 2026-08-28 nxdomain
www.matroid.com 10 2026-04-18 2026-08-14 ok

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