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.

5 hosts · 174 ms

HostCertsFirst seenLast seen
vgen.co 15 2026-04-26 2026-09-29
*.vgen.co 15 2026-04-26 2026-09-29
merch.vgen.co 3 2026-06-16 2026-08-15
link.vgen.co 5 2026-04-22 2026-08-20
help.vgen.co 4 2026-04-19 2026-08-17

Programmatic access: API GET /v1/hosts/vgen.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/vgen.co.