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.

24 hosts · 278 ms

HostCertsFirst seenLast seenDNS
hss.com 9 2026-02-16 2026-08-19 ok
*.hss.com 4 2025-11-25 2026-03-02 —
uat2.hss.com 4 2026-04-20 2026-08-18 ok
beta.hss.com 1 2026-02-16 2026-02-16 nodata
cms-lb.hss.com 1 2026-02-15 2026-02-15 ok
www-lb.hss.com 1 2026-02-15 2026-02-15 ok
*.ice.hss.com 2 2026-03-09 2026-07-25 —
gtm.hss.com 1 2025-12-17 2025-12-17 ok
preview-gtm.hss.com 1 2025-12-17 2025-12-17 ok
cms.hss.com 1 2026-02-16 2026-02-16 ok
website-cms.hss.com 1 2026-02-16 2026-02-16 ok
content-cms.hss.com 1 2026-02-16 2026-02-16 ok
orders.hss.com 3 2026-06-13 2026-08-21 ok
sit.hss.com 4 2026-04-20 2026-08-18 ok
dev.hss.com 1 2026-02-01 2026-02-01 nodata
cms-lb.dev.hss.com 1 2026-02-01 2026-02-01 ok
www-lb.dev.hss.com 1 2026-02-01 2026-02-01 ok
*.ice.dev.hss.com 2 2026-03-09 2026-07-25 —
sink.ice.dev.hss.com 1 2026-07-22 2026-07-22 ok
cms.dev.hss.com 1 2026-02-01 2026-02-01 ok
website-cms.dev.hss.com 1 2026-02-01 2026-02-01 ok
content-cms.dev.hss.com 1 2026-02-01 2026-02-01 ok
www.dev.hss.com 1 2026-02-01 2026-02-01 ok
www.hss.com 1 2026-02-16 2026-02-16 ok

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