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.

12 hosts · 307 ms

HostCertsFirst seenLast seenDNS
augustcollections.com 12 2026-05-10 2026-09-06 ok
valeria.augustcollections.com 3 2026-06-24 2026-08-26 ok
staging-valeria.augustcollections.com 1 2026-08-07 2026-08-07 ok
handbook.augustcollections.com 5 2026-05-17 2026-09-15 ok
papillon.augustcollections.com 5 2026-05-06 2026-09-08 ok
studio.augustcollections.com 5 2026-05-23 2026-09-25 ok
app.augustcollections.com 9 2026-04-14 2026-09-23 ok
atelier.augustcollections.com 5 2026-05-12 2026-09-14 ok
documents.augustcollections.com 1 2026-09-03 2026-09-03 ok
reports.augustcollections.com 5 2026-05-15 2026-09-17 ok
mta-sts.augustcollections.com 5 2026-05-09 2026-09-08 ok
www.augustcollections.com 8 2026-05-04 2026-08-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/augustcollections.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/augustcollections.com.