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.

7 hosts · 265 ms

HostCertsFirst seenLast seen
trailofbits.com 32 2026-04-24 2026-10-08
*.trailofbits.com 25 2026-04-24 2026-10-08
blog.trailofbits.com 5 2026-06-09 2026-10-07
resources.trailofbits.com 14 2026-06-01 2026-09-27
new.trailofbits.com 2 2026-06-04 2026-06-04
www.trailofbits.com 5 2026-06-12 2026-08-15
*.gateway.trailofbits.com 8 2026-04-24 2026-08-20

Programmatic access: API GET /v1/hosts/trailofbits.com (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/trailofbits.com.