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.

7 hosts · 254 ms

Download CSV
HostCertsFirst seenLast seen
lexicon.se 2 2026-03-11 2026-06-25
stage-backoffice.lexicon.se 2 2026-05-07 2026-08-30
test-backoffice.lexicon.se 2 2026-05-07 2026-08-30
true.lexicon.se 21 2026-05-26 2026-09-21
stage-client.lexicon.se 2 2026-05-07 2026-08-30
test-client.lexicon.se 2 2026-05-07 2026-08-30
www.lexicon.se 3 2026-02-28 2026-10-13

Programmatic access: API GET /v1/hosts/lexicon.se (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/lexicon.se.