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.

18 hosts · 308 ms

HostCertsFirst seenLast seenDNS
dsti.institute 6 2026-05-03 2026-07-02 ok
thepresence.dsti.institute 5 2026-05-04 2026-05-05 ok
a20.moodle.dsti.institute 1 2026-02-07 2026-02-07 ok
s20.moodle.dsti.institute 1 2026-01-31 2026-01-31 ok
a21.moodle.dsti.institute 1 2026-02-12 2026-02-12 ok
s21.moodle.dsti.institute 1 2026-02-07 2026-02-07 ok
s22.moodle.dsti.institute 2 2026-02-19 2026-07-07 ok
a19.moodle.dsti.institute 1 2026-01-24 2026-01-24 ok
s19.moodle.dsti.institute 1 2026-01-22 2026-01-22 ok
alumni.dsti.institute 8 2026-06-05 2026-10-06 ok
portal.dsti.institute 5 2026-05-24 2026-09-22 ok
email.dsti.institute 6 2026-04-13 2026-06-11 ok
admin.dsti.institute 5 2026-05-24 2026-09-21 ok
contractfiller.admin.dsti.institute 4 2026-06-04 2026-10-03 ok
contract.admin.dsti.institute 4 2026-06-06 2026-10-05 ok
learn.dsti.institute 3 2026-06-06 2026-08-02 ok
support.dsti.institute 5 2026-05-29 2026-09-26 ok
www.dsti.institute 6 2026-05-04 2026-07-03 ok

Programmatic access, with DNS A records: API GET /v1/hosts/dsti.institute (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/dsti.institute.