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.

12 hosts · 367 ms

HostCertsFirst seenLast seenDNS
lefties.com 10 2025-08-19 2026-09-28 ok
static.lefties.com 9 2025-08-19 2026-09-28 ok
social.lefties.com 12 2025-12-16 2026-07-02 ok
gtm.lefties.com 3 2026-05-22 2026-09-16 ok
discoverReceiver.lefties.com 2 2025-12-17 2025-12-17 —
ir.lefties.com 5 2026-05-27 2026-09-24 ok
payments.lefties.com 7 2025-08-19 2026-09-28 ok
news.lefties.com 5 2026-04-22 2026-09-01 ok
account.lefties.com 7 2025-08-19 2026-09-28 ok
discoverReceiver.ext.lefties.com 2 2025-12-17 2025-12-17 —
preview.lefties.com 2 2026-09-28 2026-09-28 ok
www.lefties.com 9 2025-08-19 2026-09-28 ok

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