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.

23 hosts · 258 ms

HostCertsFirst seenLast seenDNS
ulys.com 2 2025-09-18 2026-09-24 ok
*.ulys.com 2 2025-09-18 2026-09-24 —
callback-beta.ulys.com 3 2026-05-12 2026-09-24 ok
landingsbeta.ulys.com 10 2026-05-11 2026-09-06 ok
club.ulys.com 5 2026-06-03 2026-10-01 ok
www.club.ulys.com 6 2026-06-02 2026-10-01 ok
v2rec.ulys.com 3 2026-05-17 2026-10-01 ok
callback-rc.ulys.com 2 2026-05-16 2026-09-29 ok
user-rc.ulys.com 3 2026-05-13 2026-09-27 servfail
api-user-rc.ulys.com 3 2026-05-12 2026-09-24 ok
api-account-rc.ulys.com 1 2026-06-29 2026-06-29 ok
callback.ulys.com 2 2026-05-16 2026-09-29 ok
sstrk.ulys.com 5 2026-05-18 2026-09-11 ok
user.ulys.com 3 2026-05-16 2026-09-29 ok
api-user.ulys.com 3 2026-05-16 2026-10-01 ok
link.services.ulys.com 5 2026-05-28 2026-09-25 ok
landings.ulys.com 10 2026-05-09 2026-09-05 ok
link.clients.ulys.com 5 2026-05-28 2026-09-25 ok
preview-site-ulys.ulys.com 1 2026-06-29 2026-06-29 ok
api-account.ulys.com 1 2026-06-29 2026-06-29 ok
preview-site-ulys-dev.ulys.com 3 2026-02-14 2026-09-30 ok
cms-ulys-dev.ulys.com 3 2026-02-14 2026-09-29 ok
link.e-sandbox.ulys.com 5 2026-05-28 2026-09-25 ok

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