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.

4 hosts · 297 ms

HostCertsFirst seenLast seen
grthotels.com 6 2025-08-05 2026-09-14
c.grthotels.com 2 2026-07-30 2026-08-06
bookings.grthotels.com 2 2026-01-22 2026-01-23
www.grthotels.com 2 2025-08-05 2025-12-08

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