Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

12 hosts · 230 ms

HostCertsFirst seenLast seen
gentlent.com 18 2026-04-23 2026-10-06
*.gentlent.com 55 2026-04-21 2026-10-06
*.manage.gentlent.com 4 2026-05-06 2026-07-28
hosting.gentlent.com 5 2026-04-30 2026-08-28
*.pki.gentlent.com 16 2026-04-21 2026-10-06
*.rni.gentlent.com 5 2026-06-09 2026-08-31
mail.gentlent.com 3 2026-05-20 2026-08-19
*.corp.gentlent.com 12 2026-05-06 2026-09-21
services.gentlent.com 3 2026-05-24 2026-08-19
whois.gentlent.com 3 2026-06-04 2026-08-30
*.dns.gentlent.com 4 2026-05-06 2026-07-28
next.gentlent.com 2 2026-07-01 2026-07-01

Programmatic access: API GET /v1/hosts/gentlent.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/gentlent.com.