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.

8 hosts · 213 ms

HostCertsFirst seenLast seen
aeternum.site 18 2026-04-12 2026-10-06
*.aeternum.site 5 2026-05-05 2026-09-02
dna.aeternum.site 5 2026-05-16 2026-09-13
*.dna.aeternum.site 5 2026-05-16 2026-09-13
hooks.aeternum.site 4 2026-06-09 2026-10-07
*.hooks.aeternum.site 4 2026-06-09 2026-10-07
account.aeternum.site 11 2026-04-24 2026-09-03
www.aeternum.site 16 2026-04-12 2026-10-06

Programmatic access: API GET /v1/hosts/aeternum.site (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/aeternum.site.