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.

16 hosts · 339 ms

HostCertsFirst seenLast seenDNS
trulia.com 1 2026-02-01 2026-02-01 ok
*.trulia.com 1 2026-02-01 2026-02-01 —
smetric.trulia.com 2 2025-10-28 2025-10-28 ok
click.password.trulia.com 1 2026-05-09 2026-05-09 ok
click.welcome.trulia.com 1 2026-05-09 2026-05-09 nxdomain
click.update.trulia.com 1 2026-05-09 2026-05-09 ok
mortgageapi.trulia.com 5 2026-04-23 2026-09-25 ok
on.trulia.com 4 2026-04-13 2026-08-29 ok
click.information.trulia.com 1 2026-05-09 2026-05-09 ok
click.prop.trulia.com 1 2026-05-09 2026-05-09 ok
app.trulia.com 5 2026-04-30 2026-09-29 ok
qp.trulia.com 2 2025-10-01 2026-09-01 ok
flags.trulia.com 2 2025-06-11 2026-05-12 ok
click.alerts.trulia.com 1 2026-05-09 2026-05-09 ok
click.news.trulia.com 1 2026-05-09 2026-05-09 nxdomain
support.trulia.com 6 2026-06-02 2026-09-30 ok

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