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.

8 hosts · 249 ms

HostCertsFirst seenLast seenDNS
thenthgear.com 23 2026-04-12 2026-10-06 ok
*.thenthgear.com 9 2026-04-12 2026-10-06 —
email.shop.thenthgear.com 5 2026-05-03 2026-08-31 ok
email.mailer.thenthgear.com 5 2026-05-03 2026-08-31 ok
email.senter.thenthgear.com 5 2026-04-29 2026-08-27 ok
email.mails.thenthgear.com 5 2026-05-03 2026-08-31 ok
email.sent.thenthgear.com 5 2026-04-29 2026-08-27 ok
www.thenthgear.com 8 2026-04-16 2026-08-12 ok

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