Find every subdomain
of a domain.

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

4 hosts · 262 ms

HostCertsFirst seenLast seenDNS
trndysocial.com 5 2026-05-14 2026-09-06 ok
www.trndysocial.com 5 2026-05-21 2026-09-08 ok
pay.trndysocial.com 1 2026-06-06 2026-06-06 ok
www.pay.trndysocial.com 1 2026-06-06 2026-06-06 nxdomain

Programmatic access, with DNS A records: API GET /v1/hosts/trndysocial.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/trndysocial.com.