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.

18 hosts · 179 ms

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HostCertsFirst seenLast seen
lucid.co 16 2026-01-26 2026-10-13
*.lucid.co 19 2026-01-12 2026-10-13
engage.lucid.co 3 2026-06-02 2026-08-11
training.lucid.co 4 2025-10-29 2026-09-29
govtraining.lucid.co 2 2025-08-05 2026-07-06
api.lucid.co 12 2025-07-15 2026-09-16
email.lucid.co 11 2026-06-01 2026-09-27
go.lucid.co 11 2026-06-01 2026-09-28
help.lucid.co 4 2026-06-08 2026-10-06
*.app.lucid.co 7 2026-01-27 2026-09-12
failover.lucid.co 5 2026-05-15 2026-09-24
cdn-cashy-static-assets.lucid.co 7 2025-06-19 2026-09-24
corporate-assets.lucid.co 4 2026-05-30 2026-10-09
skilljar-assets.lucid.co 5 2026-05-01 2026-09-10
status.lucid.co 5 2026-05-12 2026-09-08
salesloft.lucid.co 5 2026-05-04 2026-08-31
trust.lucid.co 5 2026-05-09 2026-09-06
community.lucid.co 2 2025-08-04 2026-07-05

Programmatic access: API GET /v1/hosts/lucid.co (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/lucid.co.