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.

17 hosts · 316 ms

HostCertsFirst seenLast seenDNS
trine.edu 8 2025-07-17 2026-09-14 ok
*.trine.edu 10 2025-07-16 2026-07-13 —
moodle.trine.edu 1 2026-01-22 2026-01-22 ok
librarystaff.trine.edu 5 2026-05-29 2026-09-27 ok
catalog.trine.edu 5 2026-05-29 2026-09-27 ok
vpn.trine.edu 8 2025-09-17 2026-09-16 ok
map.trine.edu 6 2026-05-21 2026-09-18 ok
services.trine.edu 8 2026-04-21 2026-08-17 ok
libguides.trine.edu 5 2026-04-26 2026-08-23 ok
forms.trine.edu 4 2026-04-20 2026-08-25 ok
connect.trine.edu 5 2026-05-18 2026-09-13 ok
advancement.trine.edu 5 2026-04-29 2026-08-24 ok
amplify.trine.edu 1 2025-07-22 2025-07-22 nxdomain
dev-amplify.trine.edu 1 2025-07-22 2025-07-22 nxdomain
*.dev-amplify.trine.edu 1 2025-07-22 2025-07-22 —
*.amplify.trine.edu 1 2025-07-22 2025-07-22 —
identity.trine.edu 4 2025-07-16 2026-07-13 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/trine.edu (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/trine.edu.