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.

6 hosts · 316 ms

HostCertsFirst seenLast seen
polishedgeek.dev 8 2026-05-08 2026-09-28
*.polishedgeek.dev 8 2026-05-08 2026-09-28
tester234234234.polishedgeek.dev 10 2026-05-08 2026-09-03
mail.polishedgeek.dev 3 2026-06-19 2026-08-31
webmail.polishedgeek.dev 5 2026-05-19 2026-09-16
large-zoom-uploads.polishedgeek.dev 8 2026-04-27 2026-08-23

Programmatic access: API GET /v1/hosts/polishedgeek.dev (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/polishedgeek.dev.