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.

6 hosts · 301 ms

Download CSV
HostCertsFirst seenLast seen
teclan.com 8 2026-01-23 2026-10-10
*.teclan.com 6 2025-11-18 2026-10-10
gaapi.teclan.com 4 2026-05-31 2026-09-17
www.gaapi.teclan.com 3 2026-06-12 2026-09-29
support.teclan.com 12 2026-05-28 2026-09-29
www.teclan.com 3 2026-01-23 2026-01-30

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