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.

5 hosts · 247 ms

HostCertsFirst seenLast seen
pomelo.com 2 2025-08-20 2026-01-24
*.pomelo.com 3 2025-08-20 2026-01-24
*.internal.pomelo.com 1 2026-02-07 2026-02-07
analytics.pomelo.com 4 2026-04-21 2026-08-20
trust.pomelo.com 7 2026-05-28 2026-09-23

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