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.

11 hosts · 237 ms

HostCertsFirst seenLast seen
icos-ri.eu 5 2026-04-24 2026-08-22
conference.icos-ri.eu 5 2026-04-24 2026-08-22
migrate.icos-ri.eu 5 2026-06-04 2026-10-03
curve.icos-ri.eu 7 2026-05-07 2026-10-05
autoconfig.icos-ri.eu 8 2026-05-12 2026-10-06
paul.icos-ri.eu 4 2026-04-19 2026-08-16
icos-fluxnet-browser.icos-ri.eu 5 2026-04-30 2026-08-29
autodiscover.icos-ri.eu 8 2026-05-12 2026-10-06
lists.icos-ri.eu 4 2026-04-16 2026-08-15
maillists.icos-ri.eu 5 2026-04-27 2026-08-28
www.icos-ri.eu 5 2026-04-24 2026-08-22

Programmatic access: API GET /v1/hosts/icos-ri.eu (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/icos-ri.eu.