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 · 259 ms

HostCertsFirst seenLast seen
arkadia.agency 11 2026-04-13 2026-09-07
*.arkadia.agency 7 2026-05-12 2026-09-07
ai.arkadia.agency 3 2026-07-09 2026-09-07
link.arkadia.agency 5 2026-05-14 2026-09-29
influencers.arkadia.agency 19 2026-05-09 2026-09-04
short.arkadia.agency 5 2026-05-07 2026-09-06
adv.arkadia.agency 3 2026-09-22 2026-09-27
link.adv.arkadia.agency 2 2026-09-22 2026-09-27

Programmatic access: API GET /v1/hosts/arkadia.agency (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/arkadia.agency.