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.

13 hosts · 379 ms

HostCertsFirst seenLast seenDNS
theathletic.com 25 2025-07-21 2026-10-04 ok
*.theathletic.com 26 2025-07-21 2026-10-04 —
links.e1.theathletic.com 3 2025-10-14 2026-09-13 ok
links.e2.theathletic.com 3 2025-10-14 2026-09-13 ok
beta.theathletic.com 5 2026-05-21 2026-09-23 ok
webhooks-staging.theathletic.com 1 2025-06-26 2025-06-26 nxdomain
sli.theathletic.com 2 2025-07-15 2026-06-15 ok
analytics.theathletic.com 1 2025-11-18 2025-11-18 ok
links.theathletic.com 2 2025-10-12 2026-09-11 ok
webhooks.theathletic.com 1 2025-07-01 2025-07-01 nxdomain
preview.theathletic.com 5 2026-05-31 2026-09-28 ok
privacy.theathletic.com 1 2026-02-11 2026-02-11 ok
stability.theathletic.com 5 2026-05-26 2026-09-24 ok

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