Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

6 hosts · 341 ms

HostCertsFirst seenLast seenDNS
bumpy.dating 19 2026-03-24 2026-09-18 ok
*.bumpy.dating 19 2026-03-24 2026-09-18 —
public.bumpy.dating 9 2026-04-18 2026-09-30 ok
cdn.bumpy.dating 10 2026-04-22 2026-10-05 ok
files.bumpy.dating 9 2026-04-10 2026-09-22 ok
files-dev.bumpy.dating 9 2026-04-18 2026-09-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bumpy.dating (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/bumpy.dating.