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.

18 hosts · 275 ms

HostCertsFirst seenLast seen
atticus.tech 49 2026-04-21 2026-09-29
*.atticus.tech 37 2025-12-07 2026-09-29
usa.atticus.tech 6 2026-05-16 2026-09-11
page.atticus.tech 7 2026-04-23 2026-06-22
website-staging.atticus.tech 3 2026-06-16 2026-06-16
drafting.atticus.tech 12 2026-06-09 2026-10-05
*.internal.atticus.tech 2 2026-05-18 2026-05-18
finch1.internal.atticus.tech 1 2026-05-18 2026-05-18
finch2.internal.atticus.tech 1 2026-05-18 2026-05-18
finch3.internal.atticus.tech 1 2026-05-18 2026-05-18
ssohelp.atticus.tech 12 2026-06-03 2026-09-29
resources.atticus.tech 2 2026-08-28 2026-08-28
interviews.atticus.tech 5 2026-06-11 2026-06-11
annualreport.atticus.tech 6 2026-04-24 2026-06-22
trust.atticus.tech 12 2026-04-23 2026-08-19
www.atticus.tech 8 2026-06-13 2026-08-15
webby.atticus.tech 2 2026-06-16 2026-06-16
*.webby.atticus.tech 2 2026-06-16 2026-06-16

Programmatic access: API GET /v1/hosts/atticus.tech (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/atticus.tech.