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.

12 hosts · 241 ms

HostCertsFirst seenLast seen
1password.eu 5 2025-07-10 2026-10-06
*.1password.eu 3 2025-07-10 2026-06-10
share.1password.eu 1 2026-02-10 2026-02-10
api.1password.eu 4 2026-06-23 2026-08-22
b5n.1password.eu 1 2026-01-03 2026-01-03
b5cdn.1password.eu 2 2025-08-04 2026-07-05
vpn.1password.eu 1 2026-01-21 2026-01-21
shared-vpn.1password.eu 1 2026-01-21 2026-01-21
app.1password.eu 2 2025-08-04 2026-07-05
client-log-forwarder.1password.eu 3 2026-06-06 2026-09-03
events.1password.eu 1 2025-09-07 2025-09-07
www.1password.eu 2 2026-05-06 2026-10-06

Programmatic access: API GET /v1/hosts/1password.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/1password.eu.