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.

8 hosts · 301 ms

HostCertsFirst seenLast seen
sslmarket.com 2 2026-04-21 2026-10-06
freshdesk.sslmarket.com 16 2026-05-12 2026-09-07
controlcenter.sslmarket.com 2 2026-03-11 2026-09-02
osticket.sslmarket.com 2 2026-03-27 2026-09-12
www.osticket.sslmarket.com 2 2026-03-27 2026-09-12
support.sslmarket.com 2 2025-10-01 2026-10-01
www.support.sslmarket.com 1 2026-10-01 2026-10-01
www.sslmarket.com 2 2026-04-21 2026-10-06

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