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 · 295 ms

HostCertsFirst seenLast seenDNS
littletrouble.com 16 2026-04-20 2026-10-01 ok
tpscw.littletrouble.com 6 2026-06-29 2026-08-27 ok
www.littletrouble.com 15 2026-05-14 2026-09-23 ok
buy.littletrouble.com 5 2026-05-17 2026-09-19 ok

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