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.

30 hosts · 296 ms

HostCertsFirst seenLast seenDNS
mercola.com 15 2026-04-15 2026-08-11 ok
*.mercola.com 11 2026-04-15 2026-08-11 —
*.qa.mercola.com 3 2025-10-31 2025-10-31 —
bsc.mercola.com 10 2026-05-08 2026-09-05 ok
prod.mercola.com 5 2025-09-30 2026-09-01 nodata
*.prod.mercola.com 5 2025-09-30 2026-09-01 —
email-rag.prod.mercola.com 1 2026-02-03 2026-02-03 ok
flowdev.prod.mercola.com 2 2026-03-10 2026-08-10 ok
typesense.mercola.com 5 2026-05-17 2026-09-14 ok
cartimi.mercola.com 2 2026-03-30 2026-08-30 ok
*.rfk.mercola.com 1 2025-11-14 2025-11-14 —
link.mercola.com 4 2026-06-06 2026-10-04 ok
helpdesk.mercola.com 10 2026-05-13 2026-09-10 ok
pm.mercola.com 10 2026-05-08 2026-09-05 ok
smetrics.mercola.com 4 2025-08-10 2026-08-12 ok
assess.mercola.com 2 2026-04-10 2026-09-10 ok
projects.mercola.com 10 2026-05-16 2026-09-13 ok
kpg-uat.mercola.com 3 2026-03-27 2026-08-27 ok
*.uat.mercola.com 2 2025-12-18 2025-12-18 —
screening.uat.mercola.com 2 2026-04-05 2026-09-05 ok
hiring.uat.mercola.com 2 2026-04-05 2026-09-05 ok
pstextract.mercola.com 4 2026-05-05 2026-05-05 nxdomain
*.pstextract.mercola.com 4 2026-05-05 2026-05-05 —
target.mercola.com 2 2025-12-28 2025-12-28 ok
dev.mercola.com 1 2025-09-18 2025-09-18 nodata
*.dev.mercola.com 10 2025-09-18 2026-10-04 —
*.convergence.dev.mercola.com 1 2025-11-03 2025-11-03 —
analytics.dev.mercola.com 1 2026-01-28 2026-01-28 nxdomain
billioneggs.dev.mercola.com 1 2026-04-01 2026-04-01 nodata
*.billioneggs.dev.mercola.com 2 2026-04-06 2026-09-06 —

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