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.

10 hosts · 330 ms

HostCertsFirst seenLast seenDNS
playbill.com 27 2026-02-01 2026-10-04 ok
*.playbill.com 32 2025-10-07 2026-10-04 —
web.playbill.com 2 2026-05-13 2026-05-13 ok
id.playbill.com 6 2026-06-10 2026-08-09 ok
track.playbill.com 7 2026-05-07 2026-09-04 ok
demo.playbill.com 1 2025-12-03 2025-12-03 ok
*.demo.playbill.com 1 2025-12-03 2025-12-03 —
login-assets.playbill.com 1 2026-07-30 2026-07-30 ok
www-test.playbill.com 4 2026-05-01 2026-05-01 nxdomain
www.playbill.com 8 2026-05-16 2026-09-11 ok

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