Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

14 hosts · 282 ms

HostCertsFirst seenLast seen
gscs.ca 36 2026-04-11 2026-10-06
*.gscs.ca 36 2026-04-11 2026-10-06
sbc01.gscs.ca 94 2026-04-12 2026-06-23
sbc02.gscs.ca 116 2026-04-12 2026-08-20
media.gscs.ca 2 2026-01-31 2026-06-18
payportal.gscs.ca 4 2026-07-14 2026-09-11
sitegovern.gscs.ca 2 2026-01-12 2026-05-31
help.gscs.ca 1 2025-12-29 2025-12-29
wiki.help.gscs.ca 1 2026-01-15 2026-01-15
get.help.gscs.ca 1 2025-12-29 2025-12-29
forms.gscs.ca 4 2026-06-10 2026-10-08
assets.gscs.ca 5 2026-05-20 2026-09-17
status.gscs.ca 5 2026-04-29 2026-08-26
www.gscs.ca 2 2026-01-12 2026-05-31

Programmatic access: API GET /v1/hosts/gscs.ca (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/gscs.ca.