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.

36 hosts · 316 ms

HostCertsFirst seenLast seenDNS
apollo.io 31 2026-04-15 2026-09-24 ok
*.apollo.io 31 2026-04-15 2026-09-24 —
scim-1password.apollo.io 5 2026-04-25 2026-08-23 ok
knowledge.apollo.io 5 2026-05-06 2026-09-03 ok
staging.apollo.io 8 2026-04-20 2026-08-16 nodata
*.staging.apollo.io 8 2026-04-20 2026-08-16 —
storybook.apollo.io 4 2026-06-07 2026-10-04 ok
email.apollo.io 5 2026-05-05 2026-09-02 ok
em.apollo.io 10 2026-04-23 2026-08-18 ok
design.apollo.io 5 2026-05-13 2026-09-08 ok
cognition.apollo.io 5 2026-04-23 2026-08-24 ok
vpn.apollo.io 8 2026-05-12 2026-09-21 ok
*.dp-prod-gcp.apollo.io 8 2026-04-24 2026-08-25 —
*.dapi.dp-prod-gcp.apollo.io 3 2026-06-11 2026-08-25 —
*.prod-gcp.apollo.io 10 2026-04-13 2026-09-10 —
*.staging-gcp.apollo.io 4 2026-05-14 2026-07-28 —
*.preview.staging-gcp.apollo.io 6 2026-05-14 2026-07-28 —
*.ai-tooling-gcp.apollo.io 10 2026-04-14 2026-09-26 —
*.dp-stg-gcp.apollo.io 9 2026-05-08 2026-10-05 —
*.dapi.dp-stg-gcp.apollo.io 6 2026-05-08 2026-10-05 —
shared-reports.dp-stg-gcp.apollo.io 3 2026-05-19 2026-09-03 ok
shared-internal-reports.dp-stg-gcp.apollo.io 2 2026-05-20 2026-05-20 ok
jarvis-reports.dp-stg-gcp.apollo.io 3 2026-05-21 2026-09-07 ok
jarvis-reports-dev.dp-stg-gcp.apollo.io 1 2026-09-07 2026-09-07 ok
*.ops-gcp.apollo.io 5 2026-04-17 2026-09-18 —
*.spinnaker.ops-gcp.apollo.io 5 2026-04-17 2026-09-18 —
docs.apollo.io 10 2026-05-07 2026-09-02 ok
credentials.apollo.io 14 2026-05-02 2026-09-07 ok
sms.apollo.io 3 2026-05-25 2026-09-13 ok
events.apollo.io 8 2026-04-28 2026-08-24 ok
status.apollo.io 5 2026-05-16 2026-09-13 ok
staging-status.apollo.io 5 2026-05-14 2026-09-11 ok
get.apollo.io 20 2026-04-28 2026-08-24 ok
support.apollo.io 5 2026-05-06 2026-09-03 ok
trust.apollo.io 8 2026-05-01 2026-08-27 ok
netlify.apollo.io 5 2026-04-23 2026-08-20 ok

Programmatic access, with DNS A records: API GET /v1/hosts/apollo.io (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/apollo.io.