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.

10 hosts · 277 ms

HostCertsFirst seenLast seenDNS
infogerant.com 4 2026-04-21 2026-09-14 ok
srv102.infogerant.com 5 2026-05-06 2026-09-03 servfail
send.infogerant.com 7 2026-04-30 2026-09-28 ok
api.infogerant.com 7 2026-05-02 2026-09-30 ok
email.infogerant.com 5 2026-06-02 2026-08-24 ok
telecom.infogerant.com 3 2026-07-01 2026-08-30 ok
app.infogerant.com 5 2026-05-06 2026-09-03 ok
master.infogerant.com 4 2026-04-19 2026-09-12 ok
secrets.infogerant.com 6 2026-04-16 2026-09-14 servfail
www.infogerant.com 4 2026-04-21 2026-09-14 ok

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