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.

18 hosts · 457 ms

HostCertsFirst seenLast seenDNS
objectci.com 6 2025-10-28 2026-08-22 ok
prod.objectci.com 5 2026-05-18 2026-09-14 ok
checkout.prod.objectci.com 5 2026-05-18 2026-09-14 ok
image.e.objectci.com 2 2025-07-12 2026-07-30 ok
de.objectci.com 6 2025-10-28 2026-09-03 ok
se.objectci.com 6 2025-10-28 2026-09-05 ok
staging.objectci.com 8 2026-04-26 2026-08-22 ok
stg.objectci.com 5 2026-04-24 2026-08-22 ok
ch.objectci.com 6 2025-10-28 2026-09-03 ok
dk.objectci.com 6 2025-10-28 2026-09-03 ok
nl.objectci.com 6 2025-10-28 2026-09-04 ok
www.nl.objectci.com 6 2025-10-28 2026-09-04 ok
no.objectci.com 6 2025-10-28 2026-09-04 ok
development.objectci.com 8 2026-04-26 2026-08-22 ok
support.objectci.com 7 2026-05-12 2026-09-11 ok
sst.objectci.com 5 2026-04-14 2026-09-24 ok
checkout.objectci.com 2 2026-06-23 2026-08-22 ok
www.objectci.com 5 2026-04-26 2026-08-23 ok

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