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.

10 hosts · 220 ms

HostCertsFirst seenLast seenDNS
bruce.bot 10 2025-08-19 2026-09-25 ok
*.bruce.bot 2 2025-08-19 2026-07-20 —
blog.bruce.bot 6 2026-06-25 2026-10-03 ok
ph.bruce.bot 2 2025-08-12 2026-07-13 ok
callback.bruce.bot 10 2026-04-14 2026-08-11 ok
pixel.bruce.bot 2 2026-04-25 2026-04-25 ok
pixel-zep.bruce.bot 10 2026-05-07 2026-09-04 ok
status.bruce.bot 1 2026-09-03 2026-09-03 ok
www.bruce.bot 14 2026-05-30 2026-09-27 ok
story.bruce.bot 3 2026-04-28 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bruce.bot (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/bruce.bot.