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.

18 hosts · 285 ms

HostCertsFirst seenLast seenDNS
turn.ai 2 2025-06-30 2026-06-26 ok
*.turn.ai 2 2025-06-30 2026-06-26 —
apidoc.turn.ai 10 2026-04-19 2026-08-15 ok
api.turn.ai 5 2026-05-20 2026-09-18 ok
link.turn.ai 5 2026-05-27 2026-09-24 ok
url.turn.ai 6 2026-04-29 2026-08-22 ok
turn-admin.turn.ai 5 2026-05-01 2026-08-29 ok
helpcenter.turn.ai 9 2026-05-20 2026-09-15 ok
sales.turn.ai 3 2026-06-05 2026-08-13 ok
decks.turn.ai 4 2026-04-20 2026-08-22 ok
partners.turn.ai 5 2026-05-24 2026-09-22 ok
mta-sts.turn.ai 6 2026-06-03 2026-10-01 ok
status.turn.ai 5 2026-05-19 2026-09-15 ok
consent.turn.ai 4 2026-04-12 2026-08-10 ok
support.turn.ai 5 2026-05-10 2026-09-07 ok
ats-test.turn.ai 5 2026-04-22 2026-08-20 ok
i3test.turn.ai 5 2026-05-28 2026-09-26 ok
icimstest.turn.ai 4 2026-04-19 2026-08-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/turn.ai (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/turn.ai.