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.

11 hosts · 285 ms

HostCertsFirst seenLast seenDNS
stallion.ca 20 2026-04-23 2026-09-23 ok
*.stallion.ca 17 2026-04-23 2026-09-23 —
staging.stallion.ca 1 2026-09-10 2026-09-10 ok
routing.stallion.ca 2 2025-11-03 2025-11-03 ok
*.routing.stallion.ca 1 2025-11-03 2025-11-03 —
2a57j78hsrstljvqlux8inqlkmoufug.routing.stallion.ca 1 2025-11-03 2025-11-03 nodata
loki.stallion.ca 1 2026-08-18 2026-08-18 ok
scim.stallion.ca 14 2026-06-29 2026-09-21 ok
crm.stallion.ca 2 2026-08-17 2026-08-17 ok
docs.stallion.ca 5 2026-05-12 2026-09-09 ok
status.stallion.ca 1 2026-08-24 2026-08-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/stallion.ca (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/stallion.ca.